Source RIA Novosti: Russian Aerospace Forces in December will receive 4 fifth generation Su-57 fighters 
Aerospace Forces December 2021 will receive four serial fifth-generation fighters Su-57. A source in the military-industrial complex told RIA Novosti.
“In December, four serial Su-57 fighters should be transferred to the Russian Aerospace Forces from the Komsomolsk-on-Amur Aviation Plant,” the source said. p>
According to him, the Chkalov State Flight Test Center (GLITS) is currently testing the first serial Su-57, received in November last year.
In June, Military Watch named Russian missiles fighter Su-57, which are capable of destroying the American aircraft F-35A Lightning II. The author of the material suggested that the R-37M and Kh-47M2 “Dagger” hypersonic missiles could destroy an American fifth-generation fighter.