In my opinion China isn't too happy about this. Tolerating? Yes. Supporting? No.
This ain't exactly a pro-Western news souce, so it is odd to read this:
https://www.aljazeera.com/economy/2...ion-grows-china-hints-at-limits-of-friendship
I think all China cares about is getting energy from Russia.
Wiping out a city is exactly the kind of thing that would bring in outside military invervention. And I haven't been too impressed with the Russians yet (and let's be honest, you are not either)...I think the last thing Putin wants is the US and NATO deciding they have seen enough. I wouldn't be surprised if we end up with a no-fly zone as it is.