Getting a European war going that draws US forces out of the Pacific is an obvious benefit if you want to invade Taiwan.
In contrast to the Russians, the Chinese are completely dependent on international trade to keep people fed and the lights on.
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.