President Barack Obama and ASIMO, an acronym for Advanced Step in Innovative MObility, bow to each other during a youth science event at the National Museum of Emerging Science and Innovation, known as the Miraikan, in Tokyo, Thursday, April 24, 2014. Showing solidarity with Japan, Obama affirmed Thursday that the U.S. would be obligated to defend Tokyo in a confrontation with Beijing over a set of disputed islands, but urged all sides to resolve the long-running dispute peacefully. (AP Photo/Carolyn Kaster)