Vice President Joe Biden in Japan

U.S. Vice President Joe Biden voiced strong opposition Tuesday to China's new air defense zone above a set of disputed islands, showing a united front with an anxious Japan as tension in the region simmered.

Standing side by side in Tokyo with Japanese Prime Minister Shinzo Abe, Biden said the U.S. is "deeply concerned" about China's attempt to unilaterally change the status quo in the East China Sea. (AP)

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