The Sukhoi PAK FA (Russian: Perspektivny aviatsionny kompleks frontovoy aviatsii, literally "Prospective Airborne Complex of Frontline Aviation") is a twin-engine jet fighter being developed by Sukhoi OKB for the Russian Air Force and Indian Air Force.
The current prototype is Sukhoi's T-50. The PAK FA, when fully developed, is intended to be the successor to the MiG-29 and Su-27 in the Russian inventory and serve as the basis of the Sukhoi/HAL FGFA being developed with India.
India will eventually spend over $25 billion to induct 200 FGFA and 50 PAK FA advanced stealth fighter aircraft. This will be in addition to the huge investments to be made in co-developing FGFA, as with the infrastructure required to base, operate and maintain such jets in India.
The first flight, observed by Russian Prime Minister Vladimir Putin, generated a lot of interest from the Indian delegation at the air show that includes HAL chief Ashok Nayak and top officers from the Air Force.