1. BulgarianMilitary.com is not a government publication.| BulgarianMilitary.com
The first variant was developed in the Soviet Union as early as the 1980s. The version, initially referred to as the Su-27M, had a revised airframe, duck wings, an enlarged radome for the N-011 radar and improved avionics.| Bulgarian Military Industry Review
Felon or 'the Criminal'. Thus, NATO named the newest Russian fighter, Su-57, which by its characteristics is a combat multi-role fighter. The fighter is designed according to the instructions of the Russian Air Force, as part of the PAK-FA program.| Bulgarian Military Industry Review
The Sukhoi Su-30 is a Russian multi-role fighter aircraft based on the two-seat training aircraft Sukhoi Su-27UB, the development of which began in the last years of the Soviet Union.| Bulgarian Military Industry Review