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.
Any direct conflict with the North Korea will result in tens of thousands of American military causalities. If that happens, then Trump's ratings can slip below the 30 percent mark. I hope that he understands this quite well.
I don't think he cares. It's not like he wants to go for a second run...
He's going to do whatever he wants to take how much he can from the country and left the ruins to the next guy.
But I don't see how it would profit him in any way to attack North Korea. Not like USA is lacking of wars to make the weapons industry run at full production...