Like asking yankoids what they want to do with “their land”, the question is pointless and only serves to legitimize a faulty preposition.
The ROC also still claims to be the legitimate government of all of China (plus Mongolia and a sizable chunk of Russia) so its not like they’re just sitting there minding their own business either.
The ROC also claims the South China Sea as its own and has build naval bases in there. Even the DPP doesn’t want to give up those naval bases. So, it’s the Republic of Taiwan to stick it to the Mainland commies, but “akctually, we’re the Republic of China, and the South China Sea is part of Chinese naval waters, so we get to build as many naval bases as we want” to Vietnam and Indonesia.