China says it warned and tracked US warship in South China Sea - CNN

(CNN)China said it warned and tracked a U.S. Navy warship as it came close to one of its artificial islands in the South China Sea's contested waters.

Cui Tiankai, Chinese ambassador to the United States, told CNN's Christiane Amanpour on Tuesday that the U.S. operation is "a very serious provocation, politically and militarily."

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