The T-50/Su-57 prototype first flew on January 29, 2010 and as of March 2018 there are 10 Su-57 prototypes and were renamed Felons that year. This is Russia’s first stealth aircraft and was designed to cope with the F-22 and F-35. The Su-57 is made from extensive use of composite material and radar absorbing material (RAM). The original AL-41F-1 engine is under powered and will be replaced by an Izdelie 30 which is under development. The Felon has super maneuverability, super-cruise, thrust-vectoring nozzles. Russia ordered 76 Su-57s.
Russia is in the process of developing UCAV (unmanned aerial combat vehicle) or RPA (remotely piloted aircraft) the S-70 'охотник' or 'Hunter'. In 2018 Bort 053 was selected to test communications and team operations with the S-70. In 2019 Bort 053 received a new paint scheme on the top and bottom that resembles the Hunter’s silhouette. Silhouettes of the Su-57 and the Hunter with a lightning bolt below were added to the vertical stabilizers. The lightning bolt suggests some sort of electronic connection between the two aircraft.