China is never going to physically attack Taiwan, they can't afford it.

Russia can't even come close to steamrolling Ukraine and that's a land invasion. All Taiwan has to do is lob some missiles towards the Three Gorges Dam and China would be brought to its knees.

In fact, I don't even think they need to hit the damn, I think they can attack damns further up the Yangtze river and the cascade of water flowing downstream will do the job for them.