As for Taiwan, China always viewed it as a province which broke out without agreement of rest of the nation, funnily enough this is the view being spouted about Crimea by the west.
China will quite happily turn this on the west stating that West must support it in its claim for reunification.
The art of doublespeak.
Taiwan never 'broke out' from communist China. If anything, it was the other way around. The nationanlist Chinese were the legitimate government of China at the time the communists seized power, forcing their withdrawal to Taiwan.
If it's reunification the People's Republic wants, then I'm sure the Republic of China would be willing to accomdate this on the proviso that the legitimate government is restored on the mainland.