A senior Russian official has suggested that the Sukhoi Su-57 PAK-FA could be upgraded to become a “6th generation” fighter.  However, it is not clear what a “6th generation” fighter would mean in the Russian context.

The United States Air Force and the United States Navy are both looking at what they might need for their next-generation fighter aircraft, but the aside from some general top-level characteristics, those future requirements remain undefined.–

Given that the Russians have yet to field an operational fifth-generation aircraft, it remains unclear what Moscow conceives as a so-called sixth generation fighter.

“This is actually a splendid plane and it can embrace both fifth-and sixth-generation …