A batch of new Russian Su-35S fighters, manufactured by the Yury Gagarin Aircraft Plant, has been delivered to the Russian Ministry of Defense as part of a state defense order. The Su-35S is a successful development of the Soviet fourth-generation Su-27 heavy fighter. In terms of performance, the aircraft is almost on par with fifth-generation fighters, although it is inferior primarily in radar signature. The aircraft have undergone a full cycle of factory testing, have been accepted by technical personnel, and have been pilot-tested in various operating modes.