The Sukhoi Su-57 (Russian: Сухой Су-57; NATO reporting name: Felon) is a twin-engine stealth multirole fighter aircraft developed by Sukhoi. It is the product of the PAK FA (Russian: ПАК ФА, short for: Перспективный авиационный комплекс фронтовой авиации, romanized: Perspektivnyy Aviatsionnyy Kompleks Frontovoy Aviatsii, lit. ''prospective aeronautical complex of front-line air forces'') programme, which was initiated in 1999 as a more modern and affordable alternative to the MFI (Mikoyan Project 1.44/1.42). Sukhoi's internal designation for the aircraft is T-50. The Su-57 is the first aircraft in Russian military service designed with stealth technology and is intended to be the basis for a family of stealth combat aircraft.

1. What is the current status of the Su-57 program?
a) The program has been canceled.
b) The aircraft is in Russian military service.
c) The program is currently undergoing testing.
Answer: b) The aircraft is in Russian military service.

2. What is the origin of the Su-57?
a) The Su-57 was developed in the 1970s and was halted due to the fall of the Soviet Union.
b) The Su-57 was developed in the 2000s by United Aircraft (UAC).
c) The Su-57 was developed in the 1980s by Sukhoi Design Bureau within UAC.
Answer: c) The Su-57 was developed in the 1980s by Sukhoi Design Bureau within UAC.

3. Has the Su-57 been used in combat against Ukraine?
a) No, the Su-57 has not been used in combat.
b) Yes, the Su-57 has been used in combat against Ukraine.
c) It is unclear whether the Su-57 has been used in combat against Ukraine.
Answer: c) It is unclear whether the Su-57 has been used in combat against Ukraine.

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