Remember, North Korean contact imported Superdollars in IV (although he was later killed)
With this sort of connection in LC, it might be interesting to see how their empire has developed into selling WMDs to the highest bidder in the next GTA.
Chinese Triads source and buy WMDs (proven by Trevor's contact to 'pay top dollar' for the stolen nukes). These events suggest they may gain more power and sell these hardware in the next generations.
So apart from the Hydra/Lazer that would probably still be available in the next generation,
I would love to see one 'red army' equivalent ie. good old Mig29~35, Su30~37 (35 is particularly beautiful imo), T50, or my favorite - the prototype Su47.
I'm not too interested in US made jets, as in my profession and I see these things on a regular basis.
I'm not even going to the classic argument of USA vs Russia, whether our jets are superior machines, equal, or not.
It's just out of personal interest that I feel the 'badassery' about these Russian/Soviet hardware.