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By Linda Sieg and Matt Spetalnick TOKYO (Reuters) - U.S. President Barack Obama used a state visit to Japan on Thursday to try to reassure Asian allies of his commitment to ramping up U.S. engagement in the region, despite Chinese complaints that his real aim is to contain Beijing's rise. Obama is being treated to a display of pomp and ceremony meant to show that the U.S.-Japan alliance, the main pillar of America's security strategy in Asia, remains solid at a time of rising tensions over growing Chinese assertiveness and North Korean nuclear threats. "As you said, my visit here, I think, once again represents my deep belief that a strong U.S.-Japan relationship is not only good for our countries, but good for the world," Obama told Japanese Prime Minister Shinzo Abe at the start of their summit. "Our shared democratic values mean that we have to work together in multilateral settings to deal with regional hot spots Around the globe, but also to try make sure we are creating a strong set of rules that govern the international order." Behind the scenes, U.S. and Japanese trade negotiators for the two countries were working around the clock in Tokyo on a two-way trade pact seen as crucial to a broader trans-Pacific agreement.