The U.S. Navy challenged China’s vast claims to the South China Sea on Thursday, Navy officials revealed.

The U.S. Navy conducted the third freedom-of-navigation operation under President Donald Trump in the South China Sea on Thursday. The Arleigh Burke-class guided-missile destroyer USS John McCain (DDG-56) sailed within 12 nautical miles of Mischief Reef in the Spratly Island chain, according to Fox News.

A Navy P-8 reconnaissance and surveillance aircraft reportedly flew nearby.

The Arleigh Burke-class guided-missile destroyer USS Dewey sailed past Mischief Reef in late May. The Arleigh Burke-class guided-missile destroyer USS Stethem sailed near Triton Island, part of the Paracel Islands, in July.