The MiG 31 Firefox was an advanced Russian fighter prototype. Information in this entry is taken from the Firefox PDF by Kurt F Beswick at www.thinkinrussian.org[N 1] unless stated otherwise. The fundamental purpose behind the MiG-31 program was to develop an aircraft capable of intercepting anything the West currently had, due to overflights of Russia with spyplanes. Thus, the Mach 5 Lockheed D-21 drone launched from a "mother-ship" SR-71 was the only real concern Russia had in 1982, a very rea