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			 The patrol by the USS Lassen was the most significant U.S. 
			challenge yet to the 12-nautical-mile territorial limits China 
			asserts around the islands in the Spratly archipelago and could 
			ratchet up tension in one of the world's busiest shipping lanes. 
			 
			One U.S. defense official said the USS Lassen sailed within 12 
			nautical miles of Subi Reef. A second defense official said the 
			mission, which lasted a few hours, included Mischief Reef and would 
			be the first in a series of freedom-of-navigation exercises aimed at 
			testing China's territorial claims. 
			 
			China's Foreign Ministry said the "relevant authorities" monitored, 
			followed and warned the USS Lassen as it "illegally" entered waters 
			near islands and reefs in the Spratlys without the Chinese 
			government's permission. 
			 
			"China will resolutely respond to any country's deliberate 
			provocations," the ministry said in a statement that gave no details 
			on precisely where the U.S. ship sailed. 
			 
			Foreign Ministry spokesman Lu Kang later told a daily briefing that 
			if the United States continued to "create tensions in the region," 
			China might conclude it had to "increase and strengthen the building 
			up of our relevant abilities". 
			
			  Lu did not elaborate, except to say he hoped it did not come to 
			that, but his comments suggested China could further boost its 
			military presence in the South China Sea. 
			 
			"China hopes to use peaceful means to resolve all the disputes, but 
			if China has to make a response then the timing, method and tempo of 
			the response will be made in accordance with China's wishes and 
			needs." 
			 
			The second U.S. defense official said additional patrols would 
			follow in coming weeks and could be conducted around features that 
			Vietnam and the Philippines have built up in the Spratlys. 
			 
			"This is something that will be a regular occurrence, not a one-off 
			event," said the official. "It's not something that's unique to 
			China." 
			 
			White House spokesman Josh Earnest referred questions on any 
			specific operations to the Pentagon but said the United States had 
			made clear to China the importance of free flow of commerce in the 
			South China Sea. 
			 
			The U.S. Navy last went within 12 miles of Chinese-claimed territory 
			in the Spratlys in 2012. 
			 
			China claims most of the South China Sea, through which more than $5 
			trillion of world trade passes every year. Vietnam, Malaysia, 
			Brunei, the Philippines and Taiwan have rival claims. 
			 
			The Philippines, a vocal critic of China's activities in the South 
			China Sea, welcomed the U.S. action. 
			 
			"The American passage through these contentious waters is meant 
			precisely to say that there are norms as to what 
			freedom-of-navigation entails and they intend to exercise so there 
			is no de facto changing of the reality on the ground," President 
			Benigno Aquino told reporters. 
			 
			RISK OF ESCALATION 
			 
			The decision to go ahead with the patrol follows months of 
			deliberation and it risk upsetting already strained ties with China. 
			
			  "By using a guided-missile destroyer, rather than smaller vessels 
			... they are sending a strong message," said Ian Storey, a South 
			China Sea expert at Singapore's Institute of South East Asian 
			Studies. 
			 
			"They have also said, significantly, that there will be more patrols 
			– so it really now is up to China how it will respond." 
			 
			
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			Some experts have said China would likely resist attempts to make 
			such U.S. actions routine. China's navy could for example try to 
			block or attempt to surround U.S. vessels, they said, risking an 
			escalation. 
			
			Zhu Feng, executive director of the China Centre for Collaborative 
			Studies of the South China Sea at Nanjing University, said he 
			expected Beijing to limit its response as it ultimately did not want 
			confrontation. 
			 
			"Both sides will be quite verbal but real actions, I hope, will show 
			signs of exercising restraint," Zhu said. 
			 
			COMPETING CLAIMS 
			 
			Both Subi and Mischief Reefs were submerged at high tide before 
			China began a dredging project to turn them into islands in 2014. 
			 
			Under the U.N. Convention on the Law of the Sea, 12-nautical mile 
			limits cannot be set around man-made islands built on previously 
			submerged reefs. 
			 
			Washington worries that China has built up its outposts with the aim 
			of extending its military reach in the South China Sea. China says 
			they will have mainly civilian uses as well as undefined defense 
			purposes. 
			 
			The patrol comes just weeks ahead of a series of Asia-Pacific 
			summits President Barack Obama and Chinese President Xi Jinping are 
			expected to attend in the second half of November. 
			 
			Xi surprised U.S. officials after a meeting with Obama in Washington 
			last month by saying that China had "no intention to militarize" the 
			islands. 
			 
			Even before that, however, satellite photographs had shown the 
			construction of three military-length airstrips by China in the 
			Spratlys, including one each on Subi and Mischief reefs. 
			
			
			  
			
			Some U.S. officials have said that the plan for patrols was aimed in 
			part at testing Xi's statement on militarization. 
			 
			Pentagon officials say the United States regularly conducts 
			freedom-of-navigation operations around the world to challenge 
			excessive maritime claims. 
			 
			In early September, China sent naval vessels within 12 miles of the 
			Aleutian Islands off Alaska. China said they were there as part of a 
			routine drill following exercises with Russia. 
			 
			(Reporting by Andrea Shalal, Yeganeh Torbati and David Brunnstrom in 
			Washington and Ben Blanchard in Beijing; Additional reporting by Tim 
			Kelly in Tokyo, Grego Torode in Hong Kong and Lincoln Feast in 
			Sydney; Writing by Dean Yates and Alex Richardson; Editing by Robert 
			Birsel) 
			
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