That is not entirely accurate/true. You may be referring to F-7s which operate sidewinders. While the platform is indeed Chinese/Russian in origin, the fire control radar is Italian and as such integration of sidewinders is a given. The reverse is true for the Amazons which operates the LY-60 SAM. They are British in origin and while the LY-60 is actually an Aspide (Italian) which itself is based on Aim-7 Sparrow. Beyond that, these all were already obsolete at the time of induction. Think about the fact that F-7PG was inducted in 2001!!! No one gave a shit if it operates sidewinder or not. But when you talk about HQ-16A operating from SMART-S mk2, thats a different ballgame. The PLA, PLAAF, PLAN all actively operate this weapon. The Chinese dont want its source codes in western hands. Same is true for SD-10.That is the reason why PAF JF-17 will operate Chinese AESA AND WEAPONS. Otherwise the JF-17 Would be armed with AMRAAM. The reverse is also true. Italians dont want Chinese knowing their radar codes (to integrate sd-10 or pl-15 onto Vixen 1000E). Hence PAF wont operate it. BUT it would be am option married to Meteor and ASRAAM for a foreign buyer.