I would like to address some misconceptions from earlier in the topic. The Tiananmen Square massacre wasn't the lynchpin event that it's assumed to be. Chinese workers were allowed to return to work on the Peace Pearl project discreetly after the fact but at this point the Chinese had already decided to cancel the project due to rapidly escalating costs, mostly relating to the handmade nature of each aircraft needing a slightly different solution to the ones before it. There were a number of reasons for them moving towards Russian equipment:
-The PLAAF coming up against the US defence industry and quite naively thinking that The Price Is The Price when in fact, it never is and making the Peace Pearl project prohibitively expensive.
-Russia needing fast cash, now, meant they were willing to sell anything.
-"We like Americans but don't like the way their systems operate. We don't like the Russians but we know how their system work and like it." (Paraphrased)
-Israeli help in modernising and design meant it was an expensive and superfluous project.
There's more nuances but that's the broad strokes.