Let's hope neither us nor China make a miscalculation because it would be ugly. I think Russia would play us off against each other trying to get the best deal before it came down on one side or the other. If it ever did that is. Russia could just as easily sit back and let us tear each other apart.
This is how miscalculations happen. It doesn't even have to be anyone's fault, just a mistake. Yes, we need to stop China from encroaching on that whole area. It should be jointly administered between like five countries. Yes, China has a right to exercise its rights as a nation. And yes, the collective West hurt China badly for about 300 years. But we better be careful and China better too.
So far it appears is playing nice with us regarding this and North Korea in general. I'm not saying it won't all blow up in faces or that they have some elaborate endgame in mind. But so far it looks like they are playing ball with us and pressuring NK in the direction we want. We shall see how this ends up. I certainly hope for the best.