"The Tupolev Tu-125 was an unrealized project to develop a new long-range supersonic bomber for the Soviet Air Force. Development commenced in 1958 to replace the newest Tu-22. Performance.
Maximum speed: 3,500 km/h (2,175 mph; 1,890 kn)
Range: 7,000 km (4,350 mi; 3,780 nmi)
Service ceiling: 25,000 m (82,021 ft) "