The operation, which infuriated Beijing, was the latest attempt to counter what Washington sees as China’s efforts to limit freedom of navigation in the strategic waters.

The officials, speaking on condition of anonymity, said the destroyer Mustin traveled close to Mischief Reef in the Spratly Islands and carried out maneuvering operations. China has territorial disputes with its neighbors over the area.

The United States has criticized China’s construction of islands and buildup of military facilities in the area, and is concerned they could be used to restrict free nautical movement.

The latest operation, the first since January, occurred just a day after U.S. President Donald Trump lit a slow-burning fuse by signing a presidential memorandum that will target up to $60 billion in Chinese goods with tariffs, following a 30-day consultation period that starts once a list is published.

When asked about the latest operation, the U.S. military said its activities are carried out under international law and American forces operate in the region on a daily bases.

“We conduct routine and regular freedom of navigation operations, as we have done in the past and will continue to do in the future,” said Lieutenant Commander Nicole Schwegman, a spokeswoman for U.S. Pacific Fleet.

China’s Defense Ministry said two Chinese naval ships had been sent to identify the U.S. ship and warn it to leave.

It described the actions of the American ship as seriously harming China’s sovereignty and security, which threatens regional peace and stability.

Such actions cause forces from both countries to come into close proximity and could easily cause a misjudgment or accident, and create serious political and military provocation for China, it added.

China has always dedicated itself to protecting freedom of navigation and overflight in the South China Sea, but opposes “illegal and provocative” moves in the name of freedom of navigation, it said.

“We demand the U.S. side earnestly respects China’s sovereignty and security and the strong wishes of countries in the region to protect peace, stability and tranquility, and not make trouble out of nothing and stir up havoc,” it said.

“The provocative behavior by the U.S. side will only cause the Chinese military to further strengthen building up defense abilities in all areas.”

“MANUFACTURING TENSIONS”

In a separate statement, China’s Foreign Ministry said the country would continue to take all necessary steps to protect its sovereignty and peace and stability in the South China Sea, where it said the situation was developing for the better with the hard work of China and Southeast Asian nations.

The U.S. determination to “manufacture tensions” flies in the face of the wishes of countries in the region to seek cooperation and development and will not enjoy popular support, the ministry added. Read more at Reuters