How pissed do you think the Americans were when they realized that the LAVI aka J10 was paid by American Taxpayer Research that will benifit the PLAAF. I guess the US could have lived with the PAF having it, but they're certainly not happy about the PLAAF having it.
China will try to have overwelming numbers so even an inferior plane like the J10 must hurt becuase it's still a leap forward especially if there are huge numbers of it.

