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			 North Korea said it set off a hydrogen bomb last Wednesday, its 
			fourth nuclear test since 2006, angering China, the North's main 
			ally, and the United States, which said it doubted the device was a 
			hydrogen bomb. 
			 
			In a show of force and support for allies in the region, the United 
			States on Sunday sent a nuclear-capable B-52 bomber based in Guam on 
			a flight over South Korea. 
			 
			North Korea's Rodong Sinmun newspaper, the mouthpiece of the ruling 
			Workers' Party, said the United States was bringing the situation to 
			the brink of war. 
			 
			South Korean media said the United States may send to South Korea 
			B-2 bombers, nuclear-powered submarines and F-22 stealth fighter 
			jets. 
			 
			A South Koran defense ministry spokesman declined to give details. 
			 
			"The United States and South Korea are continuously and closely 
			having discussions on additional deployment of strategic assets," 
			the spokesman, Kim Min-seok, said. 
			  China called for all sides to avoid raising tension. 
			 
			"Safeguarding the peace and stability of northeast Asia accords with 
			all parties' interests," Chinese Foreign Ministry spokesman Hong Lei 
			said in response to a question about the U.S. B-52 flight. 
			 
			"We hope all parties can maintain restraint, proceed cautiously, and 
			avoid successively escalating tensions." 
			 
			'HIGHEST LEVEL READINESS' 
			 
			The chairman of South Korea's Joint Chiefs of Staff warned that 
			North Korea was likely to carry out further "sudden provocations", a 
			South Korean defense ministry official said. 
			 
			The commander of the 28,500 U.S. troops in South Korea, General 
			Curtis Scaparrotti, urged them to be vigilant. 
			 
			"I want you to maintain the highest level readiness from a long-term 
			view as joint military exercises are coming up," Scaparrotti told 
			U.S. and South Korean forces on a visit to a base, a U.S. military 
			official said. 
			 
			He was apparently referring to joint annual military exercises that 
			usually begin in February or March and invariably provoke an angry 
			reaction from North Korea. 
			 
			
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			On the diplomatic front, South Korea said its chief nuclear 
			negotiator planned to meet his U.S. and Japanese counterparts on 
			Wednesday to discuss a response to North Korea, and the next day, he 
			would meet China's nuclear envoy in Beijing. 
			 
			North Korea has been under UN Security Council sanctions since its 
			first test of an atomic device. After its third test, in 2013, the 
			Security Council took about three weeks to agree a resolution that 
			tightened financial restrictions and cracked down on its attempts to 
			ship and receive banned cargo. 
			 
			South Korea and Japan used a military hotline for the first time 
			after of North Korea's test, South Korea's defense ministry said, in 
			a sign the North's behaviour is pushing the two old rivals closer 
			together. 
			 
			South Korea has also resumed anti-North propaganda broadcasts 
			through loudspeakers along the border, a tactic that the North 
			considers insulting. It responded with artillery fire the last time 
			South Korea used the speakers in August. 
			 
			South Korea also said it would restrict access to the jointly run 
			Kaesong industrial complex just north of the heavily militarized 
			inter-Korean border to the "minimum necessary level" from Tuesday. 
			 
			The complex, where South Korean factories employ North Korean 
			workers, is an important source of revenue for the impoverished 
			North. 
			  
			
			
			  
			
			 
			(Additional reporting by Michael Martina in BEIJING; Writing by Tony 
			Munroe; Editing by Michael Perry, Robert Birsel) 
			
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