The Su-27 Flanker is a fighter aircraft designed by the Sukhoi Design Bureau and manufactured by the Irkut Corporation. The export version is the Su-27SK. Su-27 entered production in 1982 and is in service with Russia, Ukraine, Belarus, Kazakhstan, Uzbekistan and Vietnam, and is built under license in China as the F-11. A variant, the Su-30MKK, has been sold to China.