The problem is that the status quo may not be acceptable to the people of Taiwan and reunification is not acceptable not even slightly wanted by the people of Taiwan. The's not really any chance of a reunification of the current China and the current Taiwan.
> Anything Russia does to other states has got absolutely nothing to do with it.
Not really, if Putin had quickly succeeded I have not doubt that WWIII would have started with a failed attempt to take Taiwan followed by WWIII. There's no scenario where A) China can take Taiwan, and B) Taiwan will accept Chinese rule. That died 70 years ago.