The avionics finished testing late last year.
Also this is not the first Russian AESA radar in service. The Admiral Gorshkov frigate and the Gremyashchy corvette have naval AESA radars.
Over the aircraft's lifetime it is likely the sensors and avionics will get upgraded but the current systems should be good enough for operations.
The engines are still in testing but the Russians have made large investments in modern engine technology including new materials so I doubt they won't get the second stage engines to work more or less on schedule in like two years time like they are supposed to.
Also this is not the first Russian AESA radar in service. The Admiral Gorshkov frigate and the Gremyashchy corvette have naval AESA radars.
Over the aircraft's lifetime it is likely the sensors and avionics will get upgraded but the current systems should be good enough for operations.
The engines are still in testing but the Russians have made large investments in modern engine technology including new materials so I doubt they won't get the second stage engines to work more or less on schedule in like two years time like they are supposed to.