Hi Basel, I can see where the confusion may be coming from. The "older copies" that you refer to, namely the J-7/J-6/J-5, have been produced under license from the Soviet Union. The J-11B on the other hand is the pure brainchild of SAC, without any Sukhoi/KnAAPO input, and hence Russia was quite upset regarding the apperance thereof. Now, since the technologies on the J-11B are wholly different from that of the Flanker series, SAC technically has the right to sell them. However, Beijing may be more circumspect when it comes to managing Sino-Russian relations and might have blocked the deal.