Who says its 'international waters'? The Western created UN shackle? Fact is America is operating thousands of miles away from its territory. The only reason to do that is hostility and Imperialism.
Agreed, why is the U.S. standing in the way of righteous Chinese Navy sailors from claiming their birthright territorial waters of the Philippines, Vietnam, Korea, and Chinese Taipei (Taiwan is a fiction spun by pig-dog imperialist American spies).
If China doesn't want to play by the rules everyone else has agreed to, they can go become a bigger version of North Korea.