The Sukhoi Su-27 (Су-27 in the Cyrillic alphabet) (NATO reporting name ‘Flanker’) is a one-seat Mach-2 class jet fighter plane originally manufactured by the Soviet Union, and designed by the Sukhoi Design Bureau. It was intended as a direct competitor for the large American fourth generation fighters, with long 3,530 km range, heavy armament, sophisticated avionics and high agility. The Su-27 most often flies air superiority missions, but is able to perform almost all combat operations. Complementing the smaller MiG-29, its closest American counterpart is the F-15 Eagle.

There are several related developments of the Su-27 design. The Su-30 is a two-seat, dual-role fighter for all-weather, air-to-air and air-to-surface deep interdiction missions; comparable to F-15E Strike Eagle. Su-33 ‘Flanker-D’ is a navy fleet defense interceptor for use on aircraft carriers; comparable to F/A-18E/F Super Hornet. Further versions include the side-by-side 2-seat Su-34 ‘Fullback’ strike variant and the Su-35 ‘Flanker-E’ improved air defense fighter.