Two U.S. B-52s Flew Near Chinese Man-Made Islands in South China Sea: Pentagon

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Subi reef, located in the disputed Spratly Islands in the South China Sea, is shown in this handout Center for Strategic and International Studies (CSIS) Asia Maritime Transparency Initiative satellite image taken August 8, 2012. Two U.S. B-52S flew "in the area" of the Spratly Islands November 8-9, the Pentagon said. CSIS Asia Maritime Transparency Initiative/DigitalGlobe/Reuters

WASHINGTON (Reuters) - Two U.S. B-52 strategic bombers flew near artificial Chinese islands in the South China Sea this week and were contacted by Chinese ground controllers but continued their mission undeterred, the Pentagon said on Thursday.

China laims most of the South China Sea, through which more than $5 trillion in global trade passes every year, and the United States has said it will continue conducting patrols to assure freedom of navigation. Vietnam, Malaysia, Brunei, the Philippines and Taiwan have rival claims in the region.

In the latest mission, which occurred overnight on Nov. 8-9, the bombers flew "in the area" of the Spratly Islands but did not come within the 12-nautical-mile zones that China claims as territory around islands it has built in the chain, said Commander Bill Urban, a Pentagon spokesman.

"The B-52s were on a routine mission in the SCS (South China Sea)," taking off from and returning to Guam, Urban said.

Chinese ground controllers contacted the bombers but the aircraft continued their mission unabated, Urban said.

"We conduct B-52 flights in international air space in that part of the world all the time," Pentagon spokesman Peter Cook told a news briefing earlier on Thursday.

Last month, a U.S. warship challenged territorial limits around one of China 's man-made islands in the Spratly archipelago with a so-called freedom-of-navigation patrol, the most significant U.S. challenge yet to territorial limits China claims around its new islands.

U.S. and Chinese warships and aircraft regularly communicate when operating near each other in Asian waters, U.S. military officials say.