WASHINGTON — The United States on Monday joined ally Japan in vowing not to recognize China’s declaration of an air defense zone over much of the East China Sea, a move that has sharply escalated tensions. China and Japan each summoned the other’s ambassador after Beijing said Saturday it had established an Air Defense Identification Zone—which would require aircraft to obey its orders—over an area that includes islands administered by Japan. Japanese Prime Minister Shinzo Abe, who has vowed no compromise on sovereignty issues, called on China to “restrain itself” over the move, which put Tokyo’s conservative government in rare unison with South Korea and Taiwan. “I am strongly concerned as it is a profoundly dangerous act that may cause unintended consequences,” Abe told the Diet. U.S. President Barack Obama’s administration has vowed to defend Japan and said that the islands—known as the Senkakus in Japanese and the Diaoyus in Chinese—fall under the US security treaty with its ally,
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