1991 Soviet-chinese border talks fail

Let's say that the border negotiations the Soviets had with the PRC fails, the USSR still collapses, and the talks in the future between Russia and China go as successful as trying to talk Iran out of their nuclear aggressiveness. Would this make the Chinese try to appease the US more since they don't have any other major power to be buddies with or would they just isolate themselves politically? And what would Russia do?
 
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