U.S. President Barack Obama's day-long tour of Tokyo started with a welcome from Japan's Emperor and Empress in the grounds of the imperial palace.<br/> <br />Then came the fun stuff...a game of soccer with humanoid robot Asimo at the Tokyo Innovation Museum.<br/> <br />But Obama's four-day visit to Asia has a very serious side to it.<br/> <br />He's looking to convince Washington's Asian allies the U.S. is committed to its promised strategic 'pivot' towards the region.<br/> <br />On Thursday he told Japan the U.S was serious about its security and that includes islands in dispute with China.<br/> <br />(SOUNDBITE)(English) U.S. PRESIDENT BARACK OBAMA SAYING:<br/> <br />"Let me reiterate that our treaty commitment to Japan's security is absolute and Article Five covers all territories under Japan's administration including the Senkaku islands."<br/> <br />China's Foreign Ministry insisted the chain which it calls the Diaoyu islands were its territory regardless of what anyone said.<br/> <br />(SOUNDBITE)(Mandarin) CHINESE FO
