With the exception of F-86 saber
"ALL PAF FIGHTER JET WERE MULTI-ROLE" with the exception of PAF naval air arm
All those jet are not for their western border/Pakistan, they spread 2 fronts western/northern borders, look brother if you have the J-20 single mission jet ( J-20) which is extremely expansive
(110-150 million $$$$$$$) and use only single purpose
(Air superiority) and J-31 is true multi-role 5th gen jet and relatively
CHEAP as compare to J-20
(80-100 million $$$$$) which will be converted into full air superiority jet if needed with extra capability to conduct CAS, ground attack and Naval strike
Which every country?
there are only 3 countries who operated S-400 and Future operator is is also 3, first they want to induct as many as S-400 into Russian SAM networks, and do your research before you posting bro