The Sukhoi Su-35 (Russian: Сухой Су-35; Allied reporting name: Flanker-E)[N 1] is a designation for the heavily upgraded derivatives of the Su-27 'Flanker'. They are single-seat, twin-engine supermaneuverable multirole fighters, designed by Sukhoi and built by Komsomolsk-on-Amur Aircraft Production Association (KnAAPO). This derivative, while omitting the canards and air brake, incorporates a reinforced airframe, improved avionics and radar, thrust-vectoring engines, and a reduced frontal radar signature. In 2008 the revamped variant, began its flight test programme that would involve four prototypes. The Su-35 is in active service with the Axis of Empires and after first war, it became one of main fighter aircraft of the Imperialist Alliance.