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With tensions already high over Beijing's imposition of an air zone above islands administered by Japan in the East China Sea, fears are growing of a fresh showdown in a separate row in the South China Sea where the Philippines is especially concerned.

Addressing the rifts, the top US diplomat for the region challenged Beijing's so-called "nine-dash line" that outlines its territorial claims over much of the South China Sea.

Danny Russel, the US assistant secretary of state for East Asian and Pacific affairs, said that maritime claims under international law needed to be based on land features.

"Any Chinese claim to maritime rights not based on claimed land features would be inconsistent with international law," Russel told a congressional committee.

"China could highlight its respect for international law by clarifying or adjusting its claim to bring it into accordance with international law of the sea," he said.

Read more at Channel NewsAsia and U.S. Department of State

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