The T-84 main battle tank is a Ukrainian development of the Soviet T-80 main battle tank, first built in 1994 and entered service in the Ukrainian Armed Forces in 1999. The T-84 is based on the diesel-engined version, the T-80UD. Its high-performance engine makes it one of the fastest existing MBTs in the world, with a power-to-weight ratio of about 26 horsepower per tonne (19 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 120mm gun capable of firing standard NATO ammunition and guided missiles.