In 1958 the V-PVO (Soviet Air Defense Forces) requested a new high-performance interceptor capable of intercepting the most modern USAF aircraft. This requirement was motivated by the constant flights of the invulnerable CIA Lockheed U-2 and the projected entry into service of the North American XB-70 Valkyrie supersonic bomber, which would put the USSR in serious danger in case of conflict. The Sukhoi and Mikoyan-Gurevich (MiG) companies attended the request, which had to present an interceptor capable of reaching 3,000 km/h and a ceiling of 27,000 meters. Finally, only MiG company presented a prototype designated “Ye-155-P1“, which would enter service known worldwide as MiG-25 “Foxbat A”.
Foxbat A: 2 x Tumansky R.15B.300 turbojets, 73.5 kN dry or 100.1 kN with afterburner (each) Foxbat E / F: 2 x Tumansky R.15BD.300 turbojets, 86.3 kN dry or 109.8 kN with afterburner (each)