I don't buy this. Once you get a country in the mood for war, the marginal cost to them of more war gets less and less. In for a penny/in for a pound as they say.

If anything, I bet China has had to think twice about Taiwan after seeing the way the world has reacted to Russia. China has not been tested against a determined, capable enemy and their credibility as a superpower is at stake. They could lose to Taiwan even if no one helps Taiwan.