How is this different from Israel or China? Genuine question.
Maybe you could make a case for Palestine or the Senkaku Islands dispute but I don't think those examples would hold muster for a multitude of reasons.
err Tibet ? hmm Palestine ?
Noone?
China still wants to annex Taiwan, and the 50 Cent Party reliably speaks out in support of "reunification" when Western media bring up the topic. Still not quite the same, but at least the PRC has lots of missiles pointing to Taiwan (more than to the Senkakus).
It's slightly more complex than that. Officially, for the past 65 years both Republic of China and People's Republic of China have been agreeing that there is only one China, of which Taiwan is a province. There's no question about either one "annexing" what is already considered part of the country.
They have just disagreed which one is the legitimate government of that one China. Only more recently the idea of a separate , independent country on the island of Taiwan has been gaining popularity on that island.
An interview with a member of China's 50 Cent Party.