Russia's fifth-generation Su-57 fighter jet is working on the use of an unpiloted mode during tests, a source in the defenсe industry said. This reported by Sputnik.

"The T-50 flying laboratory is testing an unpiloted mode. A pilot is in the cockpit during a flight but is just controlling the operation of all systems", the source said.

The Sukhoi Su-57 (formerly known as PAK FA, or T-50) is a cutting-edge fighter jet that performs the functions of a strike aircraft and a fighter and is capable of destroying all types of air, ground and naval surface targets.

The Russian Defence Ministry placed an order for 76 Su-57 jets during the Army-2019 International Military and Technical Forum. The warplanes should be delivered to the Russian Air Force by 2028. A total of 13 jets have been made so far.