The PRC is upset over a US Navy ship sailing innocently in international waters.

The USS John S. McCain sailed within six nautical miles of Mischief Reef in the disputed Spratly Islands on Thursday as part of a “freedom of navigation operation,” US officials told news agencies.

Geng Shuang, the PRC’s Foreign Ministry Deputy Director General (Department of Information, Ministry of Foreign Affairs) claimed that the McCain’s passage

severely undermines China’s sovereignty and security.

This is disingenuous: the PRC has no sovereignty or security concerns involving the Spratlys (or any other part of the South China Sea, come to that).  Any sovereignty question involves only Malaysia, the Philippines, Taiwan, and Vietnam, the claimants to the group.