Challenge:Sino-American War over Vietnam

With a POD of 1954 you have to make China intervene militarily over the Vietnam war and go into direct conflict with America.

The Soviets need to stay officially neutral.

Bonus points if it goes nuclear.
 
That's really not hard...

In Korea, the PRC intervened because we invaded North Korea instead of just playing defense.

If we did the same, I'm sure they'd intervene again.
 
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