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			 Despite efforts to forge deeper ties with China to make East Asia 
			more stable, Beijing's declaration of a maritime air defense zone 
			has escalated its territorial dispute with U.S. ally Japan. The U.S. 
			responded by flying B-52 bombers through the zone on a training 
			mission Tuesday without informing Beijing. 
 			Analysts say the risk of a military clash between the Asian powers 
			has gone up a notch — a serious concern for the U.S. because its 
			treaty obligations mean it could be drawn in to help Japan. 
 			Meantime, relations between America's core allies in the region, 
			Japan and South Korea, have deteriorated. South Korea is bitter over 
			Japan's attitude toward its colonial past and wants more contrition 
			from Tokyo for Japan's use of Korean sex slaves in World War II. 
 			That complicates the strategic picture for the Obama administration 
			as it looks to advance its so-called pivot to Asia and strengthen 
			not just its own alliances, but get its partners in the region to 
			collaborate more. 
 			"The region is moving in a very problematic direction," said Evans 
			Revere, a former senior U.S. diplomat and East Asia specialist. 
			"That's the result of territorial disputes, historical issues, 
			long-standing rivalries and the inability of countries to put 
			history behind them and move forward in improving relations." 			
			
			  
 			Adding to this witches' brew of bickering in the region, Washington 
			is grappling with the threat posed by an unpredictable North Korea. 
			The deal the U.S. orchestrated with Iran to temporarily freeze its 
			nuclear program, despite three decades of animosity, is a stark 
			reminder of the impasse in negotiations with Pyongyang. 
 			Unlike Iran, North Korea already has a nuclear bomb, and there's 
			worrying evidence it is pressing ahead with weapons development. 
 			Analysts expect Vice President Joe Biden to broach these issues when 
			he travels to Japan, China and South Korea next week — a trip to 
			demonstrate that the top level of the administration remains focused 
			on Asia. 
 			Secretary of State John Kerry hasn't neglected the region, but his 
			primary focus is on the Mideast and is likely to remain that way as 
			he strives for the distant goals of an end to Syria's civil war, 
			peace between Israelis and Palestinians, and a comprehensive nuclear 
			agreement with Iran after the current pact expires in six months. 
 			U.S. domestic woes have contributed to a narrative that Asia is a 
			secondary concern to the administration. 
 			Obama was forced to cancel a four-nation trip to the region in 
			October because of a partial U.S. government shutdown and threat of 
			a debt default. He'll travel to Asia in April instead. 
 			Obama made Asia a foreign policy priority when he took power in 2009 
			and has been particularly active in engaging China. Not known for 
			the personal touch with foreign leaders, Obama sought to cultivate a 
			relationship with new Chinese leader Xi Jinping when he met him in 
			June at a California resort. That's part of a strategy to promote 
			cooperation between the world's two largest economies and prevent 
			their rivalry in the Asia-Pacific from spawning conflict. 			
			
			  
 			
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			But China's declaration of its East China Sea air defense zone will 
			be viewed as unhelpful. It was rejected by Japan, South Korea and 
			Taiwan, and prompted quick expressions of deep U.S. concern that it 
			could escalate tensions in the region. 
 			"This really casts bit of a pall over efforts to improve 
			(U.S.-China) relations," Revere said. 
 			The U.S. said it would not change how it conducts military 
			operations in the region and flew a pair of B-52 bombers through the 
			zone Tuesday on what officials said was a long-planned training 
			mission. 
 			China's Defense Ministry said Wednesday it had detected and 
			monitored the bombers. It said all aircraft flying through the zone 
			would be monitored, but made no mention of a threat to take 
			"defensive emergency measures" against noncompliant aircraft that 
			was included in an announcement Saturday. 
 			Bonnie Glaser, a China specialist at the Center for Strategic and 
			International Studies, expected Biden to raise the issue with 
			civilian and military leaders in China. She said that while 
			countries have a right to declare such a zone — the U.S., South 
			Korea and Japan all have them — there will be concern about how 
			China would enforce it. 
 			"The question is how many times China will scramble their jets and 
			against whom," she said. 
 			The zone encompasses unoccupied but Japanese-administered islands 
			that Japan calls Senkaku and China calls Diaoyu. Since Japan 
			nationalized some of the islands a year ago, there's been a constant 
			cat-and-mouse between the two nations' sea vessels and aircraft. 
 			There's been no skirmish, although Japan accused China in January of 
			locking targeting radar on a Japanese helicopter and frigate, which 
			underscored the risks of a clash. 
 			Proponents of the U.S. pivot view a strong American military 
			presence and diplomatic engagement as essential to maintaining the 
			decades of relative stability and economic prosperity the region has 
			enjoyed. 			
			
			  
 			But the rift between South Korea and Japan, which host some 80,000 
			U.S. forces between them, complicates that task. The nationalist 
			Japanese leader's intent to allow a more active role for its 
			military, which is constrained by a pacifist constitution, has 
			further alienated South Korea. 
 			Victor Cha, White House director for Asia affairs under President 
			George W. Bush, said that has raised concerns that Seoul is siding 
			with Beijing on the issue. Although Seoul has voiced concern over 
			the new Chinese air defense zone, he said the Obama administration 
			faces a major strategic problem: "How do you pivot to Asia when your 
			two main allies are deeply in conflict with each other?" 
			[Associated 
					Press; MATTHEW PENNINGTON] 
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