Yes, I think China is more concerned with that survival, then interested in supporting North Korea. Same with Russia. The they will both play mischief if they can, but I think that is a very thin opportunity, that could quickly hurt them both very directly.
Well this country and others have tried for years to figure out the path for a solution....but Kims nukes has changed the equation. Certainly china and Russia have concerns over who runs N.Korea....but now the US isn’t interested in preserving the status quo nor negotiating for the same Kims accustomed to and China absolutely understands this.
The ball remains in China’s hands currently....how long that will remain is where things are at of course.