Joe Biden

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U.S. Vice President Joe Biden, left, gestures during a meeting with Japanese Prime Minister Shinzo Abe, right center, at Abe's official residence in Tokyo Tuesday, Dec. 3, 2013. Biden, who is on the first leg of his three-nation Asian tour, met Abe, whose government is pressing the U.S. to more actively take Japan's side in an escalating dispute over China's new air defense zone above a set of contested islands in the East China Sea. (AP Photo/Toru Yamanaka, Pool)

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U.S. Vice President Joe Biden, right, talks with employees of DeNA during his visit to DeNA Co., Ltd, a global Internet company providing web services for mobile devices and PCs, in Tokyo Tuesday, Dec. 3, 2013. (AP Photo/Koji Sasahara)

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U.S. Vice President Joe Biden salutes upon arriving at the Tokyo International Airport in Tokyo Monday, Dec. 2, 2013. Biden is in Tokyo to meet with Japan's prime minister and lawmakers for the first leg of his Asia tour that includes China and South Korea. (AP Photo/Koji Sasahara)

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Vice President Joe Biden, center, Chinese Vice President Xi Jinping, left, and Los Angeles Mayor Antonio Villaraigosa, right, watch a dance performance during a visit to International Studies Learning Center Friday, Feb. 17, 2012 in South Gate, Calif. Chinese Vice President Xi Jinping began the last day of his U.S. visit Friday by urging closer ties and arguing that Americans benefit from their trade relationship with China. (AP Photo/Los Angeles Times, Jay L. Clendenin, Pool)

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FILE - In this Aug. 21, 2011, file photo U.S. Vice President Joe Biden, right, walks with Chinese Vice President Xi Jinping, left, as they visit the South Bridge in Dujiangyan on the outskirts of Chengdu, in southwestern China's Sichuan province. Xi will visit Iowa in February, 2012, reciprocating for Vice President Joe Biden's visit to China last August. (AP Photo/Ng Han Guan, File)