MiG-21U/UM/US, A.I.Mikoyan/M.I.Gurevich 'Mongol'

Two seat trainer versions of MiG-21;
MiG-21U (Mongol A/B) is initial trainer version, based on the MiG-21F, but with two cockpits in tandem, larger main and tires appearing on the PF version. Other specific features are one-piece forward airbrake, pilot tube above inlet (unlike on the F), and deleted armament. Later versions (Mongol-B) had increased-chord tail fin, deeper dorsal spine and repositioned parachute housing.

MiG-21US is similar to MiG-21U, but with retractable periscope for instructor (rear cockpit) and SPS blowing flaps.

MiG-21UM based on the later MiG-21MF. It has four underwing pylons and R-13-300 turbojet.

MiG-21U

MiG-21U Mongol-A

MiG-21UM Mongol-B

MiG-21UTI at Finland;