Qing Dynasty did not accept the independence of Xinjiang, Tibet, and Mongolia, nor did the Republic of China. Therefore, the Chinese government and the Chinese people will protect the sovereignty of China regardless the government is communist, socialist, capitalist, or feudalist.
Above is the map of China in 1908, in the Qing Dynasty, when Japan colonized Taiwan. Note that Taiwan was never an independent country.
Above is the Republic of China's map before the Communist Party of China took mainland China. Notice the right bottom corner shows that Taiwan and the South China Sea belong to China before the Communist Party of China reigns mainland China.
