The T-72 is a family of Soviet main battle tanks that first entered production in 1971. About 20,000 T-72 tanks have been built, and refurbishment has enabled many to remain in service for decades. The T-72A version introduced in 1979 is considered a second-generation main battle tank. It was widely exported and saw service in 40 countries and in numerous conflicts. T-72B introduced in 1985 and has new main gun, stabilizer, sights, and fire control, capable of firing 9M119 Svir guided missile, additional armour including 20 mm of applique armour in the front of hull, improved 840 hp (630 kW) engine.