F-22 can hide from, shoot first and outrun existing PAK-FA production models hence the need for stage II engine and radars.
PAK FA has L band radars that the F-22 can't even detect, that should be able to detect the presence and general location of stealth aircraft, whose location can then be scrutinised by IR and rather power nose mounted radar.
Most importantly shoot first... who cares... what with? AMRAAM? Sidewinder? How effective will they even be against an Su-30MKI let alone a MiG-35 or Su-35 or Su-57?
Which pretty much means it is going to come down to a gun fight and now where would your money be in a gun fight between east and west?
My money is on 30mm all the way.
But as previously mentioned... Russia has no interest in invading or occupying the EU... they are interested in self defence... preserving their own existence... so building up an enormous fleet of stealth fighters says I want to do what you
do and invade people and steal their shit.
What they should be doing is mass producing a mix of hypersonic missiles and cruise missiles to obliterate any enemy that threatens them, and say, look, we have 25,000 tactical nuclear weapons mounted on missiles... if we feel threatened by you in any way we are going to destroy you. You might destroy us in return, but our message to you is that we are not going to steal your countries but we will eliminate you from the gene pool if you make us.
PAK-FA is an anti F-22 platform and to succeed in its stated role it needs engine and radar improvement.
The PAK FA is to defend Russian airspace and for that role it is fine... it can kill AWACS and JSTARS and refuelling tanker aircraft, which will render F-22s and F-35s short ranged and vulnerable and its radar and sensor suite are optimised to defeat low radar cross section aircraft and their support aircraft.
Deep strike missions to destroy NATO airbases will be performed by hypersonic missiles in large numbers... remember western air power is impressive and powerful but is needed to perform both attack and defence duties because they really don't have any significant land based air defence capability outside of their aircraft. Third world countries can't really exploit that because they are generally already broken regional powers that everyone has ganged up on... not really the same situation for the west against Russia is it?