U.S. President Barack Obama Visits Japan [Getty Images]

Japan's Emperor AKihito, left, and Empress Michiko wave as U.S. President Barack Obama, not pictured, leaves a welcoming ceremony at the Imperial Palace in Tokyo, Japan, on Thursday, April 24, 2014. Obama arrived in Japan yesterday to start a four-country tour of Asia aimed at advancing a Pacific-nations trade pact and reassuring allies the U.S. will back their security interests, including in territorial disputes with China. Photographer: Kimimasa Mayama/Pool via Bloomberg

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