The Sukhoi Su-57 is the 5th generation, stealthy, single-seat, twin-engine jet multirole fighter aircraft designed for air superiority and ground attack operations. It is the successor of Su 35 and Russia’s answer to American F 35 Lightning II and F 22 Raptor.

Its first prototype first flew on 29 January 2010 and recently it has seen limited operational deployment in Syria.

Russian air-force had ordered 12 of these for its own use.
But it seems all is not well with the program and there will not beans serial production as of now.

Russia’s Deputy Defense Minister, Yuri Borisov during an interview with the state-owned Russia 24 television network on July 2, 2018, defended the move and said,
“You know that today the Su-57 is considered d to be one of the best aircraft produced in the world. Consequently, it does not make sense to speed up work on mass-producing the fifth-generation aircraft.”

He is implying that the MIG 29 Fulcrum and Su-35S Flanker-E, are more than capable of fulfilling Russia air combat needs.

While the assertion may be true to an extent there is a lot more to it. Several countries are moving on with the development of 5th generation fighters and more than a decade after the first 5th generation fighter F 22 Raptor was put in service by America, Russia is still backing away from producing a 5th generation fighter.

In this video, Defense Updates analyses why Russia has decided to stop manufacturing Su 57?