The Tupolev Tu-22M (; NATO reporting name: Backfire) is a supersonic, variable-sweep wing, long-range strategic and maritime strike bomber developed by the Tupolev Design Bureau in the 1960s. According to some sources, the bomber was believed to be designated Tu-26 at one time. During the Cold War, the Tu-22M was operated by the Soviet Air Forces (VVS) in a missile carrier strategic bombing role, and by the Soviet Naval Aviation (Aviatsiya Voyenno-Morskogo Flota, AVMF) in a long-range maritime anti-shipping role. As of 2021, before the 2022 Russian invasion of Ukraine, there were 66 of the aircraft in service. Development In 1962, after the introduction of the Tupolev Tu-22, it became increasingly clear that the aircraft was inadequate in its role as a bomber. In addition to widespread unserviceability and maintenance problems, the Tu-22's handling characteristics proved to be dangerous. Its landing speed was greater than previous bombers and it had a tendency to pitch up and strike its tail upon landing. It was difficult to fly, and had poor all-round visibility. In 1962, Tupolev commenced work on major update of the Tu-22. Initially, the bureau planned to add a variable-sweep wing and uprated engines into the updated design. The design was tested at TsAGI's wind tunnels at Zhukovsky. During this time Sukhoi developed the T-4, a four-engine titanium aircraft with canards. A response to the XB-70, it was to have a cruise speed of , requiring a major research effort in order to develop the requisite technologies. Tupolev, whose expertise is with bombers, offered the Soviet Air Force (Voyenno-Vozdushnye Sily, VVS) a massively updated version of the Tu-22. Compared to the T-4, it was an evolutionary design, and thus its appeal lay in its simplicity and low cost. The Soviet government was skeptical about the need to approve the development of a replacement aircraft so soon after the Tu-22 had just entered service. The Air Force and Tupolev, in order to save face regarding the Tu-22's operational deficiencies and to stave off criticisms from the ICBM lobby, agreed to pass off the design as an update of the Tu-22 in their discussions with the government. The aircraft was designated Tu-22M, given the OKB code "Aircraft 45", and an internal designation of "AM". Their effort was successful as the government approved the design on 28 November 1967, and decreed the development of the aircraft's main weapon, the Kh-22. The T-4 itself