Four prototypes of Su-75 Checkmate. First flight in 2024

"The production preparations for the second prototype of Su-75 have begun. In total, we are planning to build 4 prototypes," said United Aircraft corp CEO Yuri Sliusar during Moscow's Army-2022 exhibition. He besides added that at the same time as the one-man version is developed an unmanned version of the Su-75 Checkmate.