The Sukhoi Su-30MKK Flanker-G is a modification of the Su-27SK. It is considered an upgraded version of the Sukhoi Su-30. It was jointly developed by Russia and China. It is a heavy class, all-weather, long-range strike fighter, comparable to American F-15E. Su-30MK2 is a further improvement to Su-30MKK with upgraded avionics and maritime strike capabilities. The MKK and MK2 are currently operated by the People's Republic of China.