The Sukhoi PAK FA (Russian: Сухой ПАК ФА, Russian: Перспективный авиационный комплекс фронтовой авиации, Perspektivny aviatsionny kompleks frontovoy aviatsii, literally "Prospective Airborne Complex of Frontline Aviation") is a twin-engine jet fighter being developed by Sukhoi for the Russian Air Force.
The first prototype, codenamed T-50, flew for the first time during the year 2010.
The mass production version of the PAK FA will feature stealth technology and have the capability to supercruise. The jet will incorporate advanced avionics such as an Active Electronically Scanned Array (AESA) radar and an artificial intelligence system. The PAK FA is to be outfitted with the next generation of air-to-air, air-to-surface, and air-to-ship missiles.
On August 1, 2017 the PAK FA was given the designation Cy-57/Su-57.