using MiG-31 No.83210. They were successfully completed in 1980. A government decision on 6 May 1981 recommended R-33 into service. Variants R-33Standard type. R-33SImproved version. R-33EExport version. R-37Further development of the R-33. References Sources External links GlobalSecurity.org page Federation of American Scientists page Air-to-air missiles of Russia Air-to-air missiles of the Soviet Union Cold War air-to-air missiles of the Soviet Union Vympel NPO products Military equipment introduced in the 1980s