국방부와 작년에 계약 했다네요.
The first serial Su-57 will be delivered to the VKS in 2019
2019.02.18
Russia's air forces will receive the first serial fighter of the Su-57 this year,
said Yuri Slyusar, president of the United Aircraft Building Corporation in an
interview with RIA Novosti.
“During the Army-2018 forum, we signed two contracts with the Ministry of
Defense for the manufacture and supply of Su-57 and MiG-35." said Slusar.
He stressed that the plans of the Russian Ministry of Defense in the near
future to get 15 serial machines.
“At the end of last year, flight tests of the Su-57 with the engine of the
second stage began in Zhukovsky,”
https://ria.ru/20190218/1551001407.html