Full scale model of Su-75, at one of the many international air shows for manufacturers, in 2021.
Russia’s Sukhoi 75 ‘The Checkmate’ is a single engined ‘low cost’ 6th Gen fighter. It uses the AL-41F1 ‘project 117’ engine, a development of the engine used on the twin engined 5th Gen fighter Su-57, as well as the Su-35.
Full scale model, sometime in 2021.
First flight is expected sometime in 2023. After a few years of testing, Rostec (aka State Corporation for Assistance to Development, Production and Export of Advanced Technology) hopes that production can commence in 2026-27.
Rostec claims the 6th Gen fighter will cost about 30-million U.S. dollars. A two seat trainer is planned, as well as an pilotless robot version.
Artist’s concept of robot version.
The Su-75 is intended to work in conjunction with the Su-57 Felon and the S-70 Hunter drone.
Overhead view of Su-75 and Su-57, Rostec photo 2021.
Russian news reports are confusing, some claim Russian officials are considering it for the Russian Aerospace Forces, while others say the Russian military has yet to express interest in the 6th Gen fighter.
Rostec photo, 2021.
Rostec representatives admit they are hoping that potential foreign buyers will result in at least 3-hundred foreign orders, which could spur interest by the Russian military.
Rostec photo, 2021.
World War Three, Vehicle I-D: 
SUKHOI 57/T-50 PAK, PRODUCTION OF THE CONVICT (FELON) RAMPS UP!