Several nations have claims in the South China Sea, but China’s are by far the most extensive and controversial. The PRC uses its military to try to enforce sovereign rights and jurisdiction over features within the ‘Nine-Dash Line’, including the islands, rocks and atolls that make up the Paracel and Spratly islands. That’s despite a 2016 ruling by an international arbitration tribunal, which found that China’s Nine-Dash Line claim has no basis in international law.
The PRC also uses its military to deter other countries from operating in areas that it deems as ‘sensitive’. That includes using its military to deter other countries from approaching its contiguous zone—a region of sea that extends 12 nautical miles beyond a nation’s territorial waters. China’s military acts assertively when any foreign military operates close to its territory, especially major military installations.
Scroll below and click on the separate yellow headings in the text boxes below to move between analysis of excessive claims / sensitive areas and legal considerations.