China Japan Korea.... sure.
From what I understand the Chinese hate the Japs. The south Koreans hate the North and China. I'm not seeing this.. sorry.
Whats likely to happen here is China and the US go in together against their common enemy. The little fat man in the north.
All the key players in the region on the US side. China is too economically dependent on the United States. I think that the stars aligned against Kim and he has no chance to resist. Soon we will witness a rematch of the Americans in North Korea. This will raise the rating of Trump and I think he will not miss the opportunity.