The T-84, also known as the BM Oplot, is a Ukrainian main battle tank first produced by the KMDB plant in 1995. The T-84 is based on the modernised Soviet-era T-80UD tank (also designed and produced by KMDB), with the main difference being the use of a welded turret in place of the cast turret of the T-80UD, reinforced with two layers of Nizh ERA on the turret face and the frontal half of the sideskirt, as well as a revised powertrain to significantly increase the tank's reverse speed and mobility. The T-84 has served as Ukraine's main battle tank since its introduction in 1995, with several variants developed both for domestic use and export.

In 2011, the Royal Thai Army placed orders for 49 T-84s as a replacement for the ageing M60A3 and M41 tanks. The Thai export version, later known as the BM Oplot-T, features slight modifications from the T-84 to meet local requirements, such as a local radio and air conditioning. Due to delayed deliveries, the RTA initially considered cancelling the order in 2017 in favour of ordering Chinese VT-4 tanks, though they ultimately decided to procure both. Delivery of the Oplot-T was completed in March 2018, and they now serve alongside the VT-4 as the current main battle tanks of the RTA.

The BM Oplot-T was introduced in Update "Tusk Force" as part of the Japanese ground forces tree. The Oplot-T is an oddity for various reasons. The most noticeable feature of the tank (especially for Soviet tankers) is its surprisingly fast reverse speed of 32 km/h, a unique quirk that makes it stand out from other Eastern Bloc MBT designs, allowing it to retreat and reposition more quickly. In terms of protection, the Oplot-T features multiple layers of ERA, NERA, and electrical APS to protect the crew of three from harm. The main downside of the Oplot-T is its lacklustre gun with a poor depression angle, as well as some exploitable weakspots such as the gap between the sideskirt and the hull.