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Chinese naval soldiers stand guard on China's first aircraft carrier Liaoning, as it travels towards a military base in Sanya, Hainan province, in this undated picture made available on November 30, 2013. China's sole aircraft carrier left the northern city of Qingdao on Tuesday accompanied by two destroyers and two frigates, the Chinese navy said on an official news website. Ongoing tensions with the Philippines, Japan and other neighbours over disputed territories in East and South China Sea were heightened by China establishing a new airspace defense zone. China Stringer Network/Reuters