There's no surprise about China's reaction towards this war as they are known to be allies.
And yes, it is true, Russia is just ahead of this invasion. Because China has long been eyeing of this possible Taiwan invasion.
Russia and China are the biggest countries in the world (top 1 & 3, respectively), so high possibility that they can survive on their own.
So even if with this impending cut off in SWIFT with Russia, I believe, Putin already considered this scenario and he has back up plans already.
He wants to go all in in this war, so he knows what he's doing and he's prepared for these possible consequences.
We will see the impact maybe after a month or two after this invasion. Their people will be the most affected on this war crisis.