I would say that it is heavily contingent on who the 'aggressor' in the conflict is, and the circumstances by which the war broke out.
Yes.
It's hard to imagine China rushing to North Korea's aid after North Korea launched nukes at South Korea or Japan. Otherwise it' depend heavily on the overall world situation. If we go for a worst-case scenario (US-China relation deteriorating to the point any such place as Korea could be the igniting spark), that'd be totally diffrent story. It would also depend whether the conflict is localized or not.
But I don't believe there will be any way.
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