The T-80UD is a variant of the T-80U main battle tank, fitted with a diesel engine in place of the gas turbine. Design of the T-80UD is similar to the T-80U except the powerplant. Development commenced in the mid 1970s. It was accepted to service in 1987. Production of the T-80UD commenced in Ukraine the same year. About 500-800 of these MBTs were built. It was planned as the main MBT of the Soviet Union. However it's production ceased in 1991 with the collapse of the Soviet Union. These tanks are currently in service with Russia and Ukraine. A number of Ukrainian T-80UDs were exported to Pakistan in the late 1990s.
Armor protection of the T-80UD includes composite armor with built-in explosive reactive armor blocks. Vehicle is fitted with an NBC protection and automatic fire suppression systems.
The T-80UD is armed with a fully-stabilized 125-mm smoothbore gun, fitted with a carousel-type autoloader. It also fires 9M119 Refleks (AT-11 Sniper) laser-guided anti-tank missiles in the same manner as ordinary projectiles. Missiles have a maximum range of 5 km and can also aim low-flying helicopters. A total of 45 rounds are carried, including APFSDS, HEAT and HE-FRAG. 28 rounds are stored in the autoloader. Remaining ammunition is stored inside the hukk. Effective range of fire with APFSDS round is 2 000-3 000 m day and 2 000-2 600 at night. Armor penetration is about 590 - 630 mm at 2 000 m range.
T-80UD Bereza (1987): Ukrainian diesel version with 1,000-hp 6TD engine and remote-controlled antiaircraft machine gun.