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The U.S. Navy's first two advanced P-8A Poseidon patrol aircraft have arrived in Japan, U.S. military officials said on Monday, helping to upgrade America's ability to hunt submarines and other vessels in seas close to China as tension in the region mounts. The initial deployment - another four of the aircraft are due to arrive in the coming days - was planned before China last month established an air defense identification zone covering islands controlled by Japan and claimed by Beijing. The Pentagon says it is routinely flying operations in the region, including in China's newly declared air defense zone, without informing Beijing ahead of time. One U.S. defense official, speaking on condition of anonymity, told Reuters these routine operations include surveillance flights. | 
