The Tupolev Tu-4 Bull was a copy of the Boeing B-29 Superfortress. The aircraft was based off several B-29s that made emergency landings in the USSR between 1944 and 1945. The Tu-4 was also the first Soviet aircraft capable of carrying Nuclear weapons from the USSR to Western Europe and Asia. The Bull however could not reach the United States.

The Tu-4 was operated by the Soviet Air Forces and the PLAAF, the latter of which developed an Airborne Early Warning variant of the aircraft.