Not just Russia. If Russia succeeds, China is invading Taiwan next, and the whole global economy is grinding to a halt because like 80 % of world semiconductor industry is there.
Saving Ukraine means saving the world.
They'll sneak their way in just like they're rapidly expanding their influence in Africa, buying European ports and airports etc. Their tactics are completely different and our response must be as well. Of course long-term planning is the biggest weakness of democracies and the CCP's strength. So I doubt we'll be able to prevent it.
The way Xi screwed the pooch on Hong Kong, something Beijing was without controversy entitled to, looks more like an impatient dictator than the China of decades prior.
However his life is finite and I wonder if he wanted some legacy. Similar to the reason why Putin attacked Ukraine.