US President Barack Obama has said his country's commitment to the security of the Asia-Pacific region is "unshakeable".
Speaking at the end of a two-day visit to Japan, he said he welcomed a bigger role for China and called for North Korea to rejoin international talks about its nuclear ambitions.
He later travelled to Singapore for an Asia-Pacific economic summit, and will then visit China and South Korea.
Roland Buerk reports from Tokyo.
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