Read history. China is inclusive of the island of Taiwan. One Chinese military fought another Chinese military in a civil war and the loser retreated to the Chinese island of Taiwan. And then you know what happened? The USA and the UK intervened and blockaded the island to prevent the civil war from resolving.

Why did they do that? Because the US and UK wanted to have continued influence over the resources and labor of China, and they knew the Chinese military that won the war didn’t want to give them that influence, so instead they protected the loser and promised him they would keep the hope alive and give him military assistance so that one day he could fight another civil war and win and then he could give the US and UK compensation.

And what happened? Well, that Chinese military, the one that lost, formed a fascist blood thirsty dictatorshipnand prosecuted the White Terror for decades, killing many thousands for even speaking about the fact that they were all Chinese and that the losers should just get back together with the winner and finalize a union and stop kowtowing to these foreign Interlopers.

China cannot possibly annex Taiwan because it is already part of China, has been a part of China for well over a century, is ruled by the Chinese, and is recognized by nearly every world governing system as part of China. Just like no matter how much some Alabama Confederates wish their town was part of the Confederacy, no one recognizes that on the world stage. Taiwan is a special case only because of US and UK intervention and meddling.