The Sukhoi-57/Pak-Fa is the 5th generation fighter program of the Russian Air Force. The Su-57 succeeds the MiG-29 and Su-27. Once completed, the Su-57 is supposed to be one of the best fighters in the world at the moment because of the stealth technology, supercruise, and supermanueverability.
The advanced aviontics are said to be expected to outperform prior generations of fighters. Production of the Su-57 is expected to begin in 2019. If there are no hitches, the fighter aircraft will be a dangerous Russian weapon.