According to Wikipedia: "The PAK FA (Russian: Perspektivny Aviatsionny Kompleks Frontovoy Aviatsii, literally "Prospective Airborne Complex of Frontline Aviation") is a fifth-generation fighter programme of the Russian Air Force. The T-50 is the aircraft designed by Sukhoi for the PAK FA programme. The aircraft is a stealthy, single-seat, twin-engine jet fighter, and will be the first operational aircraft in the Russian Air Force service to use stealth technology. It is a multirole combat aircraft that can be used for both air superiority and ground attack missions."