View source for Engineering:T-84

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{{Infobox weapon
| name               = T-84
| image              = Strong Europe Tank Challenge 2018 (42054365704) (cropped).jpg
| image_size         = 300
| alt                = 
| caption            = A T-84U in 2018
| type               = [[Engineering:Main battle tank|Main battle tank]]
| origin             = {{wipe|Ukraine}}
| is_ranged          = 
| is_artillery       = yes
| is_vehicle         = yes
| is_UK              = yes
<!-- Service history -->| service            = 1999–present
| used_by            = Armed Forces of Ukraine
| wars               = Russo-Ukrainian War
*War in Donbas
*Russian invasion of Ukraine
<!-- Production history -->
| designer           = KMDB
| design_date        = 1975–1994
| manufacturer       = Malyshev Factory
| unit_cost          = 
| production_date    = 1994–present
| number             = 
| variants           = <!-- General specifications -->
| spec_label         = T-80<ref>''Jane's Armour and Artillery'', 2005–2006</ref>
| mass               = 46 tonnes
| length             = {{convert|7.086|m|ftin|0|abbr=on}}
| part_length        = 
| width              = {{convert|3.775|m|ftin|0|abbr=on}}
| height             = {{convert|2.215|m|ftin|0|abbr=on}}
| crew               = 3
<!-- Ranged weapon specifications -->| cartridge          = 
| cartridge_weight   = 
| caliber            = 
| barrels            = 
| action             = 
| rate               = 
| velocity           = 
| range              = 
| max_range          = 
| feed               = 
| sights             = <!-- Artillery specifications -->
| elevation          = +13°, -6°
<!-- Vehicle/missile specifications -->| armour             = Steel, [[Chemistry:Composite armour|composite]], ERA
| primary_armament   = [[Engineering:2A46 125 mm gun|125 mm smoothbore KBA-3 cannon]]  (43 rds) 120 mm smoothbore gun (40 rds)
| secondary_armament = 7.62 mm KT-7.62 coaxial machine gun<br/>12.7 mm KT-12.7 anti-aircraft machine gun
| engine             = KMDB 6TD-2 6-cylinder diesel 16.3 litre
| engine_power       = {{convert|1200|hp|kW|abbr=on}}
| pw_ratio           = 26 hp/tonne
| payload_capacity   = 
| drive              = 
| transmission       = 
| suspension         = [[Engineering:Torsion bar suspension|Torsion bar]]s, hydraulic [[Engineering:Shock absorber|dampers]]
| clearance          = {{convert|0.515|m|abbr=on}}
| fuel_capacity      = {{convert|1300|L|abbr=on}}
| vehicle_range      = {{convert|540|km|abbr=on}}
| speed              = {{convert|65|km/h|abbr=on}} – {{convert|70|km/h|abbr=on}}
| guidance           = 
| steering           = <!-- For all -->
| ref                = 
}}
{{Infobox weapon
| name               = T-84 Oplot-M
| image              = BM Oplot, Kyiv 2018, 04.jpg
| caption            = A T-84 Oplot-M main battle tank, Kyiv, Ukraine, 2018
| origin             = Ukraine
| service            = 2009–present
| is_vehicle         = yes
| used_by            = {{wipe|Ukraine}}<br/>Thailand
| weight             = 51 tonnes<ref name="Kharkiv Morozov"/>
| length             = {{convert|7.075|m|ftin|0|abbr=on}}<ref name="Kharkiv Morozov"/>
| width              = {{convert|3.400|m|ftin|0|abbr=on}}<ref name="Kharkiv Morozov"/>
| height             = {{convert|2.800|m|ftin|0|abbr=on}}<ref name="Kharkiv Morozov"/>
| armour             = modular [[Chemistry:Composite armour|composite]], ERA, APS<ref name="Kharkiv Morozov">[http://morozov.com.ua/en/body/oplot_mbt.php/]{{Dead link|date=February 2021 |bot=InternetArchiveBot |fix-attempted=yes }} Kharkiv Morozov Machine Building-The BM Oplot main battle tank</ref>
| primary_armament   = [[Engineering:2A46 125 mm gun|125 mm smoothbore KBA-3 cannon]] with 46 rounds<ref name="Kharkiv Morozov"/>
| engine             = KMDB 6TD-2E opposed piston 6-cylinder (12 pistons) diesel (1,200 hp) or<br/>
KMDB 6TD-4 opposed piston 6-cylinder diesel (1,500 hp)<ref name="Kharkiv Morozov"/>
| transmission       = Automatic
| fuel_capacity      = {{convert|1140|L}}<ref name="Kharkiv Morozov"/>
| pw_ratio           = 24.7 hp/t (6TD-2E)<br/>30 hp/t (6TD-4)<ref name="Kharkiv Morozov"/>
| suspension         = [[Engineering:Torsion bar suspension|Torsion bar]]
| clearance          = {{convert|0.50|m|ftin|abbr=on}}<ref name="Kharkiv Morozov"/>
| vehicle_range      = {{convert|500|km|abbr=on}}<ref name="Kharkiv Morozov"/>
| speed              = Road {{convert|70|km/h|abbr=on}}<br/>Off-road: {{convert|45|km/h|abbr=on}}<ref name="Kharkiv Morozov"/>
}}
{{stack end}}

The '''T-84''' is a {{wipe|Ukraine}} [[Engineering:Main battle tank|main battle tank]] (MBT), based on the [[Place:Soviet Union|Soviet]] [[Engineering:T-80|T-80]] MBT introduced in 1976, specifically the diesel engine version: T-80UD. The T-84 was first built in 1994 and entered service in the Ukrainian Armed Forces in 1999. Its high-performance [[Engineering:Opposed-piston engine|opposed-piston engine]] makes it a fast tank, comparable to other modern MBTs with a [[Engineering:Power-to-weight ratio|power-to-weight ratio]] of about 26 [[Horsepower|horsepower]] per tonne (19 [[Kilowatt|kW]]/t).

The T-84 Oplot is an advanced version incorporating an armoured ammunition compartment in a new turret bustle. Ten of these entered Ukrainian service in 2001. The T-84-120 Yatagan is a prototype model intended for export, mounting a 120&nbsp;mm gun able to fire  [[Engineering:120×570mm NATO|NATO-standard tank ammunition]] and [[Engineering:Anti-tank guided missile|anti-tank guided missile]]s.

== Development history ==
After the adoption of the [[Engineering:T-80|T-80]] tank, the Soviets began improving its design. The disadvantages of the [[Engineering:Gas turbine|gas-turbine]] engine were readily apparent, and so several design projects were initiated to adopt a diesel alternative.

=== Development of the T-80UD ===
Leningrad Kirov Plant (LKZ) began work in 1975 with a diesel 2V16 1500&nbsp;hp engine on a T-80B chassis. This was designated the Ob. 219RD. Work was not completed until 1983. The design bureau at Omsk Transport Engineering Design Bureau developed a test bed, called the Ob. 644, powered by the V-46-6 of the [[Engineering:T-72|T-72]]. Further work on these was not continued, as the main focus at the time was on the gas-turbine engine favored by Defence Minister Dmitry Ustinov.{{sfn|Zaloga|2009|p=25–26}}

In 1975, Kharkiv Morozov Machine Building Design Bureau (KMDB) began work on the Object (Ob.) 278, a T-80 powered by a 6TD 1000&nbsp;hp diesel engine developed for the improved [[Engineering:T-64|T-64]] and {{ill|Object 450|lt=T-74|ru|Т-74}} (Ob. 450). This quickly became outclassed by the {{ill|Object 476|lt=Ob. 476|ru|Объект 476}}, and so lost favor. The Ob. 478M was a more sophisticated model than the Ob. 478. Improvements included the Sistema fire control system, Shatter active protection system, and a 1,500&nbsp;hp diesel engine. This too was abandoned as it was considered too costly.{{sfn|Zaloga|2009|p=25–26}}

After the death of Ustinov in 1984, the strength of the design bureau of the LKZ began to weaken and the Ministry of Defense started to think seriously about equipping the T-80 tanks with diesel engines.{{sfn|Zaloga|2009|p=25–26}}

In September 1985, the government approved the development start of a diesel-powered T-80U. Five prototypes of the Ob. 478B with the 6TD engine were produced by year's end. Prototypes of a less sophisticated model, called Ob. 478A, were built for comparison. The government approved production of the Ob. 478B in 1986. The Soviet Army noted problems with the tank, and full-scale production was delayed to make changes. The Soviet Army also opposed a plan to name the tank the T-84, as KMDB had originally envisioned, because it would draw attention to the fact that the Soviets were operating four tanks (T-64, T-72, T-80 and T-84) with more or less similar characteristics. The Central Committee settled the debate, siding with the Army. It was subsequently adopted into service as the T-80UD.{{sfn|Zaloga|2009|p=27}}

The T-80UD was first deployed to the 4th Guards Tank Division and the 2nd Guards Motor Rifle Division. It was first publicly shown at the 1990 Moscow Victory Day Parade, then later in the 1991 Soviet coup d'état attempt.{{sfn|Zaloga|2009|p=27}}

=== Development of the T-84 ===
KMDB developed a welded turret to replace cast turrets, which were no longer made in Ukraine after the breakup of the Soviet Union. A T-80UD with this turret, Ob. 478BK, was completed in 1995. Ukraine delivered 175 Ob. 478BE to Pakistan by 1999. The Ob. 478D with Aynet fire control system and Buran night sight was trialed. Pilots of the Ob. 478DU and Ob. 478DU2 were also produced. One prototype appeared at International Defence Exhibition (IDEX) in 1995 as the "T-84 Supertank." An Ob. 478DM appeared at IDEX 1999 as the T-84M. The Ob. 478DU4 gave rise to the T-84 Oplot, which was marketed to Turkey. The 125&nbsp;mm caliber gun was replaced with a 120&nbsp;mm one able to fire NATO ammunition, and designated the T-84-120. This was marketed to Turkey as the Yatagan, and was trialed there in 2000.{{sfn|Zaloga|2009|p=38–42}}

The Ukrainian government eventually made good on its promise to buy the T-84 for the Ukrainian Army. Ten T-84Ms were delivered from 2001 to 2003. Ukraine was forced to sell off four of these to the United States when it struggled to finance the tanks.{{sfn|Zaloga|2009|p=38–42}}

=== Development of the T-84-120 ===
The T-84-120 Yatagan was developed in 2000 in Kharkiv to NATO standards for the Turkish tender for a new MBT.<ref name=":0">{{Cite web |title=T-84-120 'Yatagan': Sharpened Sabre |url=https://forum.warthunder.com/index.php?/topic/563719-t-84-120-yatagan-sharpened-sabre/ |access-date=2022-12-25 |website=War Thunder - Official Forum |language=en-GB}}</ref> The tank featured a 120mm smooth bore gun that was capable of firing AT-11 Sniper ATGMs, a reloading mechanism and blow-out panels.<ref name=":0" /> The Yatagan was also equipped with communications equipment from the French Thomson company, an FN Herstal machine gun, automatic transmission, a 6TD-2 diesel engine with 1200hp and FCS taken from Oplot.<ref name=":1">{{Cite web |title=Ukrainian armor - Oplot-M, T-64M Bulat and other. |url=https://sturgeonshouse.ipbhost.com/topic/61-ukrainian-armor-oplot-m-t-64m-bulat-and-other/ |access-date=2022-12-25 |website=Sturgeon's House |language=en-US}}</ref> In total, three 120mm guns of different designs were tested on the tank.<ref>{{Cite web |title=T-84 Yatagan MBT main battle tank 120mm cannon at Kiev military parade August 2018 |url=https://defensewebtv.com/international-news/video/t-84-yatagan-mbt-main-battle-tank-120mm-cannon-at-kiev-military-parade-august-2018 |access-date=2022-12-25 |website=defensewebtv.com |language=en-gb}}</ref> The T-84-120 Yatagan also participated in the Kyiv parade.<ref>{{Cite web |title=Yatagan tank to be showcased at military parade in Kyiv |url=https://www.ukrinform.net/rubric-defense/2522157-yatagan-tank-to-be-showcased-at-military-parade-in-kyiv.html |access-date=2022-12-25 |website=www.ukrinform.net |language=en}}</ref> The current condition of the tank is unknown.<ref name=":1" />

==Design==

The T-84's outstanding feature is a 26&nbsp;hp/t power-to-weight ratio. It is also designed to perform well in hot climates, and includes an air-conditioned crew compartment ([[Physics:Operating temperature|operating temperature]] range is claimed to be −40 to 55&nbsp;°C).

The BM Oplot is a further development of the prior T-84 Oplot. The tank has a conventional layout with the driver's compartment at the front, fighting compartment in the middle and engine at the rear, accommodating a crew of three.

The driver sitting in the centre is provided with a single-piece hatch cover that opens to the right. The commander on the right and the gunner on the left have single-piece hatches.

The tank has a length of 9.7&nbsp;m (including the forward-facing gun), a width of 3.4&nbsp;m without removable side skirts, and a height of 2.8&nbsp;m. The combat weight of the tank is 51 tons.<ref name="Kharkiv Morozov"/>

===Armament===
The Oplot is armed with a [[Engineering:Smoothbore|smoothbore]] [[Engineering:2A46 125 mm gun|125&nbsp;mm KBA-3 cannon]], a KT-7.62 (PKT) coaxial machine gun and a KT-12.7 anti-aircraft machine gun. The main gun is fed by a loading system equipped with conveyor, automatic loader, and control system. The ammunition includes high explosive fragmentation (HE-FRAG), [[Engineering:Armour-piercing fin-stabilized discarding sabot|armour-piercing fin-stabilized discarding sabot]] (APFSDS) [[Physics:Kinetic energy penetrator|kinetic energy penetrator]], and [[Engineering:High-explosive anti-tank|high-explosive anti-tank]] (HEAT).

The main gun can also fire a laser guided missile against armoured ground vehicles and hovering helicopters within the range of 5,000m. The missile can be fired on the move against travelling targets. A tandem-charge warhead fitted on the missile can defeat targets equipped with explosive reactive armour (ERA) and advanced spaced armour.

The Oplot has 46 rounds of ammunition for the main gun, of which 28 rounds are placed in the automatic loader. Other ammunition types carried are 1,250 rounds for [[Engineering:PK machine gun|KT-7.62]] machine gun, 450 rounds for KT-12.7 machine gun and 450 rounds for AKS Assault rifle.<ref name="Kharkiv Morozov"/>

===Fire control===
The vehicle has three forward-facing periscopes in front of the driver's cupola. The centre periscope can be replaced with a night driving device.

The fire control system includes a gunner's day sight, PNK-6 commander's panoramic sighting system, PTT-2 thermal imaging sight, anti-aircraft sight and anti-aircraft machine gun control system. Detection range of targets for thermal sighting system is up to 8&nbsp;km.

The tank is also equipped with LIO-V ballistic computer, armament stabiliser and other systems.

The advanced fire-control system enables the gunner or commander to lay and fire the main armament on the move. The stationary and moving targets can be hit with a high first round hit probability.<ref name="Kharkiv Morozov"/>

===Protection===
The protection system includes multilayer passive armour, [[Engineering:Nizh (explosive reactive armour)#Duplet-2M|Duplet explosive reactive armour]] (ERA), Zaslin Active Protection System, Varta optronic countermeasures system and other tank protection means.

Built-in new generation Duplet anti-tandem-charge warhead ERA protects against APFSDS, HESH and HEAT rounds.

Duplet improves protection against:
* Hand anti-tank grenades, hand-held, and stationary grenade launchers and recoilless guns (including ammunition with tandem-charge warheads)
* [[Engineering:Anti-tank guided missile|Anti-tank guided missile]]s (ATGMs) of TOW-2, MILAN, and Shturm-S type
* HEAT projectiles fired by [[Engineering:2A46 125 mm gun|125 mm tank smoothbore guns]]
* APFSDS projectiles fired by [[Engineering:2A46 125 mm gun|125 mm]] and 120&nbsp;mm tank guns

Both sides of the driver's compartment are fitted with ERA panels for extended protection. The hull sides are hinged with large rubber skirts to withstand the attacks of man-portable anti-tank weapons. The modular ERA package can be easily replaced or upgraded as needed by future requirements.

The Oplot features a Varta optronic countermeasures system for deceiving incoming missiles and anti-tank guided weapons. The system integrates laser warning sensors, infra-red jammer, and smoke or aerosol screen laying system. The optronic countermeasure system can:
* confuse the guidance systems of ATGMs by emitting laser jamming covering the horizontal plane of ±18° relative to the main gun tube and ±2° in the vertical plane
* jam ATGM guidance systems that use [[Physics:Laser guidance|laser guidance]] illumination of targets, semi-automatic laser guided homing projectiles, and artillery systems equipped with laser range-finders by activating the remote fast-deploying aerosol screens in a sector of ±45° relative to the main gun tube

Crew's collective protection system protects the crew and interior equipment against effects of nuclear explosions, radioactive substances, toxic agents, biological warfare agents, and detects and suppresses fires in the compartments of crew and power pack.

The Oplot tank can withstand an explosion of up to 10&nbsp;kg trinitrotoluene (TNT) under the tank track and up to 4&nbsp;kg TNT under the driver's compartment.
The vehicle has overpressure-type NBC protection system and can be fitted with track mine-clearing systems.<ref name="Kharkiv Morozov"/>

Due to the collapse of Soviet Union, the Malyshev Factory was no longer able to obtain ceramic armour modules from Russia and only the initial batch of T-84 were produced with such. Instead, later batches of T-84's composite armour is composed of special purpose rubber sandwiched between steel and alloy plates. The exact difference in performance between the new and prior armor is unknown and depends on the performance of dynamic armor.{{citation needed|date=March 2022}}

===Engine and mobility===
BM Oplot is powered by a 6TD-2E 6-cylinder turbocharged liquid-cooled engine, which delivers {{convert|1200|hp|kW|0}}. It is improved and more environmentally friendly version of the prior 6TD-2 diesel engine, used on the T-84 MBT. The tank could also be powered by a more powerful 6TD-3 diesel, developing {{convert|1500|hp|kW|0}}. Both engines could use diesel, jet engine fuel, petrol or any mixtures of them.

The engine provides a maximum on-road speed of {{convert|70|km/h|mph|0}} and a range of {{convert|500|km|mi|0}} with added fuel tanks. The tank is also equipped with a diesel-electric auxiliary power unit {{convert|10|kW|hp|0}} to supply power to onboard systems when the main engine is off.

BM Oplot is equipped with [[Engineering:Torsion bar suspension|torsion bar suspension]]. Either side of the six dual rubber-tyred road wheels are provided with idler at forward, drive sprocket at the rear, and track support rollers.

The first, second and sixth road wheel stations are fitted with hydraulic shock absorbers. The tank can negotiate a gradient of 32° and side slope of 25°. Equally, the tank can ford a water depth of 5m using deep water fording equipment.<ref name="Kharkiv Morozov"/>

==Variants==
[[File:Танк_Т-84.png|thumb|right|An early model T-84 tank, whose appearance is near-identical to the T-80UD. Later versions have reactive armour integrated more smoothly with the hull.|alt=]]
[[File:T-84 Oplat guided onto a tank transporter.jpg|thumb|right|A BM Oplot guided onto a [[Engineering:Tank transporter|tank transporter]]]]
[[File:2012_Eurosatory_Ukraine_tank.JPG|thumb|right|A BM Oplot at Eurosatory 2012]]
;Object 478
:Prototype.

;Object 478M
:Improvements included the Sistema fire control system, Shatter active protection system, and a 1500&nbsp;hp diesel engine.

;Object 478A Comparison model.
:A simplified Object 478B.

;T-80UD (Object 478B)
:See T-80UD.<ref name=":2">{{cite web |title=Танк БМ «ОПЛОТ» (Объект 478ДУ9-1) |url=http://btvt.info/1inservice/bm_oplot.htm}}</ref>

;T-80UD (Object 478BE)
:T-80UD for export to Pakistan.<ref name=":3">{{Cite web |title=Про затвердження додаткового переліку військового майна Збройних Сил, яке може бути відчужено |url=https://zakon.rada.gov.ua/go/687-2013-%D1%80 |access-date=2023-07-09 |website=Офіційний вебпортал парламенту України |language=uk}}</ref><ref name=":4" />
:'''T-80UD (Object 478BE-1)'''
::Variant of the 478BE with a welded turret. 

;T-80UD (Object 478BEM)
:More similar to the T-84 variants but was designated as T-80UD. Made for export to the US for testing in 2004. Included an auxiliary power unit (APU). Did not include Shtora-1.<ref name=":2" /><ref name=":4" />
:'''Object 478BEM-1'''
::Included Drozd-1 active protection system (APS). Three built.
:'''Object 478BEM-2'''
::Included air conditioning. One built.

;T-80UD (Object 478D)
:Featured a new 1200 hp 6TD-2 engine.<ref name=":4">{{Cite web |last=Basharov |first=Alexander |date=2015-09-28 |title=Наследники «объекта 478Б» {{!}} Еженедельник «Военно-промышленный курьер» |url=http://vpk-news.ru/articles/9259 |archive-url=https://web.archive.org/web/20150928192255/http://vpk-news.ru/articles/9259 |archive-date=2015-09-28 |access-date=2023-07-09 }}</ref>

;T-84 (Object 478DU)
:Object 478D with a T-64 hull. Prototype.<ref name=":4" />

;T-84 (Object 478DU2)
:One of the various prototypes for the T-84. Featured a welded turret with integrated reactive armor. Smoke grenades were moved from the front of the turret onto the top rear part. This smoke launcher configuration was kept for the T-84 after this. Manufactured in 1992.<ref name=":3" /><ref name=":4" />

;T-84 (Object 478DU4)
:One of the various prototypes for the T-84. Featured new reactive armor on the sideskirts and an APU. Manufactured in 1999.<ref name=":3" /><ref name=":4" />

;T-84 (Object 478DU5)
:One of the various prototypes for the T-84. Included an air conditioner. Participated in Turkish trials.<ref name=":4" />

;T-84 (Object 478DU8)
:One of the various prototypes for the T-84. Made for Malaysian trials. Track width was extended to 600 mm.<ref name=":4" />

;T-84 (Object 478DU9)
:The first serially produced T-84 variant. New welded turret and Shtora-1 countermeasures suite, new electronics, new main gun, new armor, and 1,200&nbsp;hp (895&nbsp;kW) 6TD-2 diesel engine.<ref>{{Cite web |title=T-84 «Объект 478ДУ9» |url=http://btvt.narod.ru/4/84/t84.htm |access-date=2023-07-09 |website=btvt.narod.ru}}</ref>

;''Oplot-M'' (Object 478DU9-1)
:Modernized, or "BM Oplot": The newest and most sophisticated version of the T-84 is an upgraded version of the "T-84 Oplot" mounting more advanced armor, new electronic countermeasure systems, and others. One visible feature is the new PNK-6 panoramic tank sight.<ref name=":2" /><ref name="urlOplot-M Main Battle Tank (MBT) - Army Technology">{{cite web |url=https://www.army-technology.com/projects/oplot-m-main-battle-tank-ukraine/ |title=Oplot-M Main Battle Tank (MBT) - Army Technology |archive-url=https://web.archive.org/web/20190322152600/https://www.army-technology.com/projects/oplot-m-main-battle-tank-ukraine/ |archive-date=2019-03-22 |url-status=live }}</ref><ref>[http://photopribor.ck.ua/en/products/defense/btt/pnk-6/ Panoramic Tank Sighting Complex (PNK-6)] {{webarchive|url=https://web.archive.org/web/20091129023958/http://photopribor.ck.ua/en/products/defense/btt/pnk-6/|date=November 29, 2009}}</ref>

;''Oplot-T'' (Object 478DU9-T)
:"BM Oplot-T" is an export version for Thailand.<ref>{{cite web |url=http://thaidefense-news.blogspot.ru/2016/11/oplot-2-2.html |title=รวมภาพ รถถังหลัก OPLOT - กองพันทหารม้าที่ 2 พล.ร.2 รอ. |publisher=THAIDEFENSE-NEWS |access-date=2017-01-17 |archive-url=https://web.archive.org/web/20170118050744/http://thaidefense-news.blogspot.ru/2016/11/oplot-2-2.html |archive-date=2017-01-18 |url-status=live }}</ref> It has some minor modifications to meet local requirements, such as different radio, air conditioner and so on.{{citation needed|date=December 2021}} Thailand ordered 49 of these tanks. Originally it was planned that all of them will be delivered by 2014. However, due to ongoing military conflict in Ukraine, the delivery was postponed to and completed in 2018.<ref name=":2" /><ref>{{Cite news|title=Final six of 49 Ukraine battle tanks delivered to Thai army|work=Bangkok Post|url=https://www.bangkokpost.com/thailand/general/1518662/final-six-of-49-ukraine-battle-tanks-delivered-to-thai-army |access-date=2021-12-15}}</ref>

;Object 478DU10
:Proposal for a more advanced variant of the BM Oplot (Object 478DU9-1).<ref name=":2" />

;T-84-120 ''Yatagan'' (Object 478N)
:A prototype version of Oplot tailored for evaluation by the Turkish Army (prototype designation, KERN2-120).<ref>{{Cite web |title=Основной боевой танк Т-84-120 «Ятаган» |url=http://armor.kiev.ua/Tanks/Modern/T84/t84_120/ |access-date=2023-07-09 |website=Броне-сайт |language=ru}}</ref> Mounts a 120&nbsp;mm main gun which fires both [[Engineering:120×570mm NATO|120 mm NATO]] rounds (like the M829 [[Chemistry:Depleted uranium|DU]] series) and a special 120&nbsp;mm version of the AT-11 Sniper ATGM. Most significantly, the Yatagan features a completely redesigned "Cassette style" bustle mounted [[Engineering:Autoloader|autoloader]],<ref>{{Cite web |title=Yatagan Prototype Main Battle Tank &#124; Military-Today.com |url=http://www.military-today.com/tanks/t84_yatagan.htm |accessdate=11 March 2023 |website=www.military-today.com}}</ref> similar to the ones used on [[Engineering:Leclerc tank|Leclerc]] and [[Engineering:K2 Black Panther|K2 Black Panther]], replacing the Soviet-era carousel autoloader. This redesign allows all ammunition in the ready-rack to be separated from the crew and equipped with blowout panels, features considered standard for NATO MBTs. It also has automated gear shifting in place of a mechanical gear selector, driver's T-bar control replacing tiller bars, air conditioning, and projectile muzzle velocity sensor, and differences in the fire control system, communications, etc.
:'''Object 478N1'''
::Planned production variant of the T-84-120

;BREM-84 ''Atlet'' (Object 478BP)
:[[Engineering:Armoured recovery vehicle|Armoured recovery vehicle]] based on the T-84 ''Oplot'' chassis.<ref name=":4" />

;BREM-T
:[[Engineering:Armoured recovery vehicle|Armoured recovery vehicle]] based on the T-84 ''Oplot-T'' chassis.<ref>{{cite web |url= http://thaidefense-news.blogspot.ru/2013/12/oplot_8.html |title=การฝึกอบรมหลักสูตรรถถัง OPLOT ของทหารไทยที่ยูเครน |publisher= Thai defense news |access-date= 2017-01-17 |archive-url= https://web.archive.org/web/20170118050849/http://thaidefense-news.blogspot.ru/2013/12/oplot_8.html |archive-date= 2017-01-18 |url-status=live}}</ref>

;BMU-84
:Armoured vehicle-launched bridge.

;BTMP-84
:Heavy [[Engineering:Infantry fighting vehicle|infantry fighting vehicle]] prototype based on the T-84 Oplot tank, with lengthened hull, an extra pair of road wheels, and a rear compartment for five infantrymen.

==Service history==
===Ukraine===
The first T-84 prototype vehicle rolled out in 1994, and in the same year it was decided to build several more vehicles. They were subjected to extensive company and army trials. After successful completion of the extensive trials programme in the late 1990s the T-84 entered service with the Ukrainian Army in 1999.<ref>{{cite web |url= http://www.morozov.com.ua/eng/body/history4-19.php |archive-url= https://archive.today/20131223042642/http://www.morozov.com.ua/eng/body/history4-19.php |url-status=dead |archive-date= 2013-12-23 |title=KMDB - T-84 |publisher= Morozov |date= 2000-08-24 |access-date=2014-07-23 }}</ref>

During the Russian invasion of Ukraine, at least one T-84U was deployed with the 3rd Tank Brigade in Donbas, near Barvinkove and Slovyansk.<ref>{{Cite web |title=Ukraine War: Hidden tanks near the front line |url=https://twitter.com/Militarylandnet/status/1539332353553797120 |website=Twitter |publisher=Sky News}}</ref>  T-84 tanks were believed to be deployed with the 14th Mechanized Brigade in Donbas.<ref>{{Cite web |last=Axe |first=David |title=Ukraine Made Just A Handful Of Speedy T-84 Tanks. Now They're On The Front Line. |url=https://www.forbes.com/sites/davidaxe/2022/05/29/ukraine-made-just-a-handful-of-speedy-t-84-tanks-now-theyre-on-the-front-line/ |access-date=2022-07-14 |website=Forbes |language=en}}</ref>

===Thailand===
In March 2011, the Royal Thai Army placed an order for 49 Oplot-T to replace its fleet of aging M41A3 Walker Bulldog light tanks. In September 2011, the Malyshev Plant announced plans to produce the first batch of five Oplot-T tanks for the Thai Army by the end of the year. Under the contract, the Ukrainian company will make 49 tanks worth over US$200 million.<ref>[http://www.ukrinform.ua/eng/news/malyshev_plant_to_produce_tanks_for_thailand_by_year_end_289191] {{Webarchive|url=https://web.archive.org/web/20131224110749/http://www.ukrinform.ua/eng/news/malyshev_plant_to_produce_tanks_for_thailand_by_year_end_289191|date=2013-12-24}} Oplot-M tanks for the Thai Army, UKR inform.</ref>

The government approved 7.155 billion [[Physics:Thai baht|baht]] to purchase the first 49 Oplot tanks to be assigned to several units: the 2nd Cavalry battalion (Royal Guard at Fort Chakrabongse, Prachinburi), the 4th Cavalry battalion (Royal Guard at Kiakkai, Bangkok), the 8th Cavalry battalion (Fort Suranari, Nakhon Ratchasima), and the 9th Cavalry battalion (Fort Ekathotsarot, Phitsanuloke).<ref>{{cite web|url= http://breakingnews.nationchannel.com/read.php?newsid=508154&lang=T&cat=|script-title=th:วาระแทรกซื้อรถถังยูเครน ครม.อนุมัติ 7.2 พันล้าน|work=The Nation (Thailand)|access-date=4 May 2011|language=th|archive-url= https://web.archive.org/web/20110812205748/http://breakingnews.nationchannel.com/read.php?newsid=508154&lang=T&cat=|archive-date=12 August 2011|url-status=live}}</ref><ref>{{cite web|url= http://www.thairath.co.th/content/pol/169018|script-title=th:รถถัง7พันล้าน ครม.สั่งลา เอาใจกองทัพ|language=th|work=Thai Rath |date=4 May 2011|access-date=5 May 2011 |archive-url= https://web.archive.org/web/20110507074758/http://www.thairath.co.th/content/pol/169018|archive-date=7 May 2011|url-status=live}}</ref><ref>{{cite web|url= http://www.matichon.co.th/news_detail.php?newsid=1304570454&grpid=&catid=02&subcatid=0200|script-title=th:สำนึกในการซื้อ "อาวุธ" ของกองทัพ กรรมวิธีในการสร้างฉันทามติจากสังคม|language=th|publisher= มติชน|access-date=5 May 2011|archive-url= https://web.archive.org/web/20110506225046/http://www.matichon.co.th/news_detail.php?newsid=1304570454&grpid=&catid=02&subcatid=0200|archive-date=6 May 2011|url-status= live}}</ref>

In April 2017, it was reported that following the delayed deliveries from this tank, the Royal Thai Army was expected to decline the remainder of the sale and acquired the Chinese [[Engineering:VT-4|VT-4]] main battle tank instead of the Ukrainian tank, due to the long term delivery schedule.<ref>{{cite web |last1=Yeo|first1=Mike|title=Thailand to buy more Chinese tanks, reportedly for $58M|url= http://www.defensenews.com/articles/thailand-to-buy-more-chinese-tanks-reportedly-for-58m|website=Defense News|access-date=7 April 2017|archive-url= https://archive.today/20170407130729/http://www.defensenews.com/articles/thailand-to-buy-more-chinese-tanks-reportedly-for-58m|archive-date=7 April 2017|location=Melbourne, Australia|date=4 April 2017|url-status=dead}}</ref><ref>{{cite news|url=https://www.bangkokpost.com/archive/more-china-arms-deals-taking-shape/1173469 |title=More China arms deals taking shape &#124; Bangkok Post: news |newspaper=Bangkok Post |access-date=2020-06-10}}</ref> The signed order for 49 units had to be completed by the month of January, 2017, it was reported that other deliveries may not be expected.<ref>{{cite web|url=https://economics.unian.info/1739862-ukrainian-mbts-for-thailand.html|title=Ukrainian MBTs for Thailand|access-date=3 November 2018|archive-url=https://web.archive.org/web/20190105004944/https://economics.unian.info/1739862-ukrainian-mbts-for-thailand.html|archive-date=5 January 2019|url-status=live}}</ref>

A 26 March 2018 press release by Ukroboronprom stated that the 2011 contract for supplying Oplot-T tanks to Thailand had successfully completed and that the last party of tanks had passed checks by the customers and would be sent to the buyer in the near future.<ref>{{cite web|url=http://en.interfax.com.ua/news/economic/494641.html|title=Contract with Thailand on Oplot tanks supply completed – Ukroboronprom director general|access-date=3 November 2018|archive-url=https://web.archive.org/web/20180704123917/https://en.interfax.com.ua/news/economic/494641.html|archive-date=4 July 2018|url-status=live}}</ref>

==Operators==
<!--READ FIRST: This section is for cited entries only. Please do not add entries into this list without a citation from a reliable source. All entries without a citation will be removed. Thank you.-->
[[File:T-84 operators.png|thumb|300px|A map of T-84 operators in blue]]

===Current operators===
* {{UKR}}
: The Ukrainian Ground Forces reportedly had 6 T-84 in service as of 2021,<ref>The Military Balance 2021, p. 209</ref> but the current number is unknown. Battlefield footage published in early 2023 indicates least one of the tanks was possibly damaged by a Russian-made ZALA Lancet drone.<ref>{{Cite web |title=Russian Kamikaze drone crashes into Ukraine's T-84 tank |url=https://defence-blog.com/russian-kamikaze-drone-crashes-into-ukraines-t-84-tank/|access-date=2023-07-29 |website=Defence Blog |language=en-UK}}</ref>

On May 12, 2023, Defense Minister Reznikov drove an Oplot at a training ground in Kharkiv Oblast and subsequently announced that the Armed forces of Ukraine would order an unspecified number of Oplots.<ref>{{Cite web |title=Ukraine's Defence Minister rides Oplot tank, says Defense Ministry will order them for army |url=https://news.yahoo.com/ukraines-defence-minister-rides-oplot-144334204.html |access-date=2023-05-12 |website=Yahoo News |language=en-US}}</ref>
* {{THA}}
: According to ''The Military Balance'' 2019, Thailand had acquired 49 Oplot-T(Object 478DU9-T) main battle tanks.<ref>{{Cite journal |date=2019|title=Thailand|url=https://www.iiss.org/publications/the-military-balance|journal=The Military Balance |volume=119|issue=1|page=311|doi= 10.1080/04597222.2018.1561032|s2cid=219624604}}</ref>

=== Evaluation-only operators ===
* {{Flagu|United States}}
: 1 unit, for technologies analysis and operational OPFOR training.<ref>{{cite web|url= http://opk.com.ua/%D1%83%D0%BA%D1%80%D0%B0%D1%97%D0%BD%D0%B0-%D0%B7%D0%B4%D1%96%D0%B9%D1%81%D0%BD%D0%B8%D1%82%D1%8C-%D0%B5%D0%BA%D1%81%D0%BF%D0%BE%D1%80%D1%82%D0%BD%D1%83-%D0%BF%D0%BE%D1%81%D1%82%D0%B0%D0%B2%D0%BA/|title=Україна Здійснить Експортну Поставку Одного Танку "Оплот" до США |website= OPK |access-date=3 November 2018|archive-url= https://web.archive.org/web/20181104050025/http://opk.com.ua/%D1%83%D0%BA%D1%80%D0%B0%D1%97%D0%BD%D0%B0-%D0%B7%D0%B4%D1%96%D0%B9%D1%81%D0%BD%D0%B8%D1%82%D1%8C-%D0%B5%D0%BA%D1%81%D0%BF%D0%BE%D1%80%D1%82%D0%BD%D1%83-%D0%BF%D0%BE%D1%81%D1%82%D0%B0%D0%B2%D0%BA/|archive-date=4 November 2018|url-status=live}}</ref>

===Potential sales===
* {{PAK}}
: In 2017, Ukraine was in talks with Pakistan for the potential sale of 100 Oplot tanks. Though Pakistan evaluated the Oplot in 2015-2017, it selected the [[Engineering:VT-4|VT-4]] main battle tank instead.<ref>{{cite web |last1=Adamowski |first1= Jaroslaw |date=9 August 2017 |title=Ukraine in talks to sell Pakistan 100 tanks |url= https://www.defensenews.com/land/2017/08/09/ukraine-in-talks-to-sell-pakistan-100-tanks/ |website=Defense News}}</ref> However later on, Heavy Industries Taxila and Ukrspecexport signed a [[Finance:Memorandum of understanding|MoU]] worth $600 million to upgrade the existing fleet of Pakistan's T-80UD MBTs possibly to Oplot-M standard.<ref>{{cite web|url=https://pakstrategic.com/pakistan-armys-t-80ud-mbt-modernization-program/|website=PakStrategic.com|title=Pakistan Army's T-80UD MBT: Modernization Program|date=18 August 2021|author=Muhammad Arslan}}</ref><ref>{{cite web|url=https://thediplomat.com/2017/03/ukraine-and-pakistan-move-forward-with-armor-deal/|website=The Diplomat|author=Franz-Stefan Gady|title=Ukraine and Pakistan Move Forward With Armor Deal|date=7 March 2017}}</ref>

===Failed bids===
* {{AZE}}
:{{as of|2011|01|alt=In January 2011}}, [[Place:Azerbaijan|Azerbaijan]] showed interest in the Oplot main battle tank. The Defense Ministry of Ukraine has long been holding negotiations on this issue.<ref name="azeroplot">{{cite web|url= http://www.news.az/articles/politics/29475|title=Azerbaijan to purchase new Oplot tank from Ukraine|date=8 January 2011|website=News.az|access-date=8 January 2011|archive-url= https://web.archive.org/web/20110110171835/http://www.news.az/articles/politics/29475|archive-date=10 January 2011|url-status=live}}</ref> In June 2013, it has been made public that Azerbaijan had instead purchased 100 Russian [[Engineering:T-90|T-90]] tanks,<ref>{{cite web |url= http://itar-tass.com/politika/1208918 |title=ИТАР-ТАСС: Политика - Россия поставила Азербайджану 100 танков Т-90С |publisher=Itar-tass |access-date=2014-07-23 |archive-url= https://web.archive.org/web/20140525215131/http://itar-tass.com/politika/1208918 |archive-date=2014-05-25 |url-status=live }}</ref> in a series of rearmament deals worth $4 billion with Russia.<ref>{{cite web |last=Agayev |first= Zulfugar |date=2013-08-13 |url= https://www.bloomberg.com/news/2013-08-13/azeri-russian-arms-trade-4-billion-amid-tension-with-armenia.html |title= Azeri-Russian Arms Trade $4 Billion Amid Tension With Armenia |publisher=Bloomberg |access-date=2014-07-23 |archive-url= https://web.archive.org/web/20150119232310/http://www.bloomberg.com/news/2013-08-13/azeri-russian-arms-trade-4-billion-amid-tension-with-armenia.html |archive-date=2015-01-19 |url-status=live }}</ref>

* {{Flag|Malaysia}}
:The T-84 Yatagan was offered to the Malaysian Army in 2002.<ref>{{cite web | url=https://www.neweurope.eu/article/delegation-hopes-sell-t-84-tanks-malaysia/ | title=Delegation hopes to sell T-84 tanks to Malaysia | date=24 August 2002 }}</ref> But the contract was lost to the Polish PT-91.

* {{PER}}
:In 2009, Peru reportedly tested the Oplot tank, but the government of Alan Garcia later decided to acquire test examples of the Chinese MBT-2000 in late 2010, only to have the government of his successor, Ollanta Humala, abandon the purchase in early 2012 to seek other alternatives.<ref>{{cite news|url= http://www.larepublica.pe/07-03-2012/el-ejercito-renueva-proyecto-para-sustituir-los-viejos-tanques-t-55|language=es |title=El Ejército renueva proyecto para sustituir los viejos tanques T-55|work=La Republica|date=March 7, 2012|last=Páez|first=Ángel|access-date=June 2, 2012|archive-url= https://web.archive.org/web/20120522104344/http://www.larepublica.pe/07-03-2012/el-ejercito-renueva-proyecto-para-sustituir-los-viejos-tanques-t-55|archive-date=May 22, 2012 |url-status= live}}</ref><ref>{{cite web|url= http://www.armyrecognition.com/march_2012_new_army_military_defence_industry/peruvian_army_discards_the_chinese_mbt-2000_for_the_russian_t-90_better_for_areas_in_peru_1303124.html |title= Peruvian army discards Chinese MBT-2000 for the Russian T-90 better for the areas in Peru|date= March 13, 2012 |website= Army recognition |access-date=June 2, 2012 |archive-url= https://web.archive.org/web/20120516191854/http://www.armyrecognition.com/march_2012_new_army_military_defence_industry/peruvian_army_discards_the_chinese_mbt-2000_for_the_russian_t-90_better_for_areas_in_peru_1303124.html |archive-date=May 16, 2012|url-status=live}}</ref> {{as of|2013|05|alt= In May 2013}}, the T-84 was reported to be part of comparative tests to be conducted by Peru. The T-84 competed against the [[Engineering:T-90|T-90]]S, the [[Engineering:M1 Abrams|M1A1 Abrams]], the Leopard 2A4 and A6, and the [[Engineering:T-64|T-64]] also offered by Ukraine.<ref>[http://www.army-technology.com/news/newsrussia-t90s-battle-tank-peruvian-army Peruvian Tank Contenders] {{Webarchive |url= https://web.archive.org/web/20130609154729/http://www.army-technology.com/news/newsrussia-t90s-battle-tank-peruvian-army |date=2013-06-09}}, Army Technology, May 17, 2013</ref>{{Unreliable source?|reason=domain on WP:BLACKLIST |date=June 2016}} By September 2013, only the T-84, T-90S, Russian [[Engineering:T-80|T-80]], and M1A1 Abrams were still competing.

== Gallery ==
Object 478 at National Museum of the History of Ukraine in the Second World War, [[Place:Kyiv|Kyiv]]:
<gallery widths="180">
file:Object 478 2.JPG
file:Object 478 8.JPG
file:Object 478 12.JPG
file:Object 478 15.JPG
file:Object 478 16.JPG
file:Object 478 21.JPG
file:Object 478 1.JPG
</gallery>

==See also==
* PT-91M
* [[Engineering:M-84AS|M-84AS]]
* [[Engineering:M-95 Degman|M-95 Degman]]
* [[Engineering:Karrar (tank)|Karrar]]
* T-80BVM
* [[Engineering:T-90|T-90]]
* [[Engineering:Type 99 tank|Type 99 tank]]
* TR-125

==References==
{{Reflist}}

==Sources==
* {{cite book |last1=Zaloga |first1=Steven J. |last2=Markov |first2=David |date=2000 |title=Russia's T-80U Main Battle Tank |place=Hong Kong |publisher=Concord Publications |isbn=962-361-656-2}}
* {{cite book |last1=Zaloga |first1=Steven J. |date=17 February 2009 |title=T-80 Standard Tank: The Soviet Army's Last Armored Champion |publisher=Osprey Publishing, New Vanguard |isbn=978-1-84603-244-8}}

==External links==
{{Commons|T-84}}
* [http://www.armyrecognition.com/ukrainian_army_main_battle_tank_heavy_armoured/oplot_t-84_main_battle_tank_ukrainian_army_ukraine_description_pictures_technical_data_sheet_identif.html T-84 Oplot Data Sheet and pictures]
* [http://www.morozov.com.ua/ Kharkiv Morozov Machine Building Design Bureau]—Ukrainian producer of the T-80. KMDB's pages for [https://archive.today/20120629152258/http://www.morozov.com.ua/eng/body/t80ud.php T-80UD], [https://archive.today/20130113224325/http://www.morozov.com.ua/eng/body/t84.php T-84 Oplot], [https://archive.today/20120907083249/http://www.morozov.com.ua/eng/body/oplot.php T-84 Yatagan], and [http://www.morozov.com.ua/eng/body/oplot_mbt.php T-84 Oplot-M].
* [http://www.globalsecurity.org/military/world/ukraine/t-84.htm T-84 MBT] at globalsecurity.org
* [http://www.military-today.com/tanks/oplot_m.htm T-84 MBT] at military-today.com
* Hromadske.ua, “[https://en.hromadske.ua/posts/ukraines-tanks-are-so-good-its-own-army-cant-afford-them Ukraine’s Tanks Are So Good, Its Own Army Can’t Afford Them],” 2017-09-14.


[[Category:Tanks with autoloaders]]

{{Sourceattribution|T-84}}