Vladimir Vladimirovich isn't an insane warmonger and understands power a lot better than Biden OR the guy who's pulling Biden's strings. He doesn't mind getting in our face and playing the tough guy because that's his style. You should read his biography, a very insightful look into his personality. He was training with a unit of KGB to prepare for an assignment in the west during the cold war - a VERY strict, demanding course of study for the select few - and he got dropped because he got into a fistfight with three guys outside a pub. He broke one of their arms and they broke his career path.
In short, he's a crime boss with a short man's attitude and nukes. He will take advantage where he finds it but he's nowhere near the level of threat that Xi poses to us. Xi has stepped forward into Mao's shoes and has consolidated the power to the point where he is China's newest Emperor. He's pushing at all of his borders and his mouthpieces are making threats, regularly. Rather than wasting time growling at Putin, we'd be better served by some intense, out of the public eye, negotiating and planning with all of our Pacific allies.
As it stands now, if Xi chose to gobble up Taiwan, he could probably do it and Biden wouldn't do anything except raise hell and levy sanctions. IF that happened, China would own the Pacific going forward. No U.S. ally in the region, not even Japan or Oz would trust us to help them in a similar instance. THAT would be the beginning of the end of American power projection in the east and it would mark the descent into second-class status and insecurity for our citizens and even military around the world. That in itself wouldn't be a tragedy, IMO, but until the CCP is firmly in the driver's seat and at the top, we run a very real risk of falling into the Thucydides Trap.
Thucydides Trap: Definition, Theory & Historical Examples - Video & Lesson Transcript | Study.com
A shooting war with China would end quickly or quickly escalate to a nuclear exchange. My guess is that China will reabsorb Taiwan within the next couple of years and the U.S. will do nothing kinetic at all. I hope the leaders in Taipei do the same thing to their island that the Czars did with Russia when they were invaded. Scorched earth, total destruction of any and all usable infrastructure, and kill as many invaders as possible before falling - like Hong Kong - into slavery to the CCP.