In fact, North Korea still relies on old Soviet-era MiG-21 warplanes the country acquired from the Soviet Union in the 1960s.

The MiG-21 would remain in production in the USSR until ... After the 1973 Paris Peace Accords ended US involvement in the Vietnam War, followed by the fall of South Vietnam in 1975, the VPAF ...

One was of IAF Mig-21 Bison and other a PAF aircraft. “Electronic signatures gathered by us indicate PAF aircraft was F-16,” said the IAF sticking to its earlier version of the sequence of event.