Will be a good partner for "illegally copied" MiG-29/Su-27s :3to mix the cards and make it difficult to precisely identify who delivered what, there could be the option of the SU-27 family, to which the J-11 also belongs, or the North Koreans who came into possession of a couple of examples purchased who knows where , they make a clone "without permission".
But maybe we are just fantasizing and DPRK already has its own indigenous project and all it needs is collaboration to realize it and put it into production.
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...IF (a big one) this thing is real.