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U.S. Vice President Joe Biden and Japan's Prime Minister Shinzo Abe attend a joint news conference following their meeting at the prime minister's official residence in Tokyo

U.S. Vice President Joe Biden (L) and Japan's Prime Minister Shinzo Abe attend a joint news conference following their meeting at the prime minister's official residence in Tokyo December 3, 2013. Biden urged Japan and China to lower tensions that have spiked since Beijing announced an air defense zone over disputed islands in the East China Sea, while repeating that Washington was worried by the move. REUTERS/Toru Hanai (JAPAN - Tags: POLITICS)

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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