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President Barack Obama, center, walks with Japanese Emperor Akihito, behind president Obama, and his wife Empress Michiko, left, past a line of flags as he arrives for a welcome ceremony at the Imperial Palace in Tokyo, Thursday, April 24, 2014. Facing fresh questions about his commitment to Asia, Obama will seek to convince Japan's leaders Thursday that he can deliver on his security and economic pledges, even as the crisis in Ukraine demands U.S. attention and resources elsewhere. (AP Photo/Carolyn Kaster)

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