** FILE ** In this Feb. 22, 2013, file photo, President Barack Obama shakes hands with Japan's Prime Minister Shinzo Abe in the Oval Office of the White House in Washington. (AP Photo/Charles Dharapak, File)

** FILE ** In this Feb. 22, 2013, file photo, President Barack Obama shakes hands with Japan's Prime Minister Shinzo Abe in the Oval Office of the White House in Washington. (AP Photo/Charles Dharapak, File)