The Tupolev Tu-160 (NATO reporting name: Blackjack) is a supersonic, variable-sweep wing heavy strategic bomber designed by the Tupolev Design Bureau in the Soviet Union. It is the largest and heaviest Mach 2+ supersonic military aircraft ever built and second only to the XB-70 Valkyrie in overall length. It is the largest and heaviest combat aircraft, the fastest bomber now in use and the largest and heaviest variable-sweep wing airplane ever flown.