Post WW II Treaties do not allow nuclear weapons on Japanese soil or in Japanese waters; not even US nuclear warships are welcome there.
However, I think China is concerned that a North Korea isolated from the rest of the world would result in a North Korea as a source of jobless impoverished refugees fleeing to China to survive, and a North Korea that has no means of supporting the basic needs of its people. As North Korea's closest neighbor, China would shoulder the burden of much of the civilian chaos that would result from UN isolation.





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