Sudan
Sudanese Air Force. Eighteen MiG-21PF fighters and two MiG-21U izdeliye 66-600 trainers were delivered in 1970, followed by 18 MiG-21M fighters and four MiG-21US trainers in 1971. By 1992 there were only seven fighters and two trainers remaining, with perhaps half being serviceable; none are in service today. Twelve second-hand MiG-21s were to be delivered in 2007 from the Ukraine, apparently ordered because the Eastern European mercenaries employed by the Sudanese government preferred Russian-built aircraft over the Chinese-built F-7s in service with the SAF. The only air-to-air action known to have involved Sudanese MiG-21s occurred on September 20, 1972, when several MiG-21Ms forced a Libyan AF C-130H to land.
Read more about this topic: Mikoyan-Gurevich Mi G-21 Operators, Former Operators