
For the Russians, it must be rather sobering that we had superior engines in 1988. I get the feeling that even if they stole the info, they couldn't mass produce it given its tolerances, advanced materials etc. Ditto for stealth in general. The Chinese? Maybe. But building and deploying a 5th generation jet is clearly vexing. It's a LONG process, gobbles up insane amounts of $ and.... I don't think even the Chinese are there yet.
It may look the part, but these Russian and Chinese designs can't possibly compete without the engines, stealth and avionics necessary to compete with the F-22 and F-35. And provided we do 6th gen right (and buy enough of them), it's just going to get worse for them as the decades march on..