Beijing Warns U.S. to 'Act Cautiously' Over South China Sea

China said on Tuesday it had "irrefutable" sovereignty over disputed islands in the South China Sea after the White House vowed to defend "international territories" in the strategic waterway.

White House spokesman Sean Spicer in his comments on Monday signaled a sharp departure from years of cautious U.S. handling of China's assertive pursuit of territorial claims in Asia.

"The U.S.