North Korean leader Kim Jong Un said Thursday his country had developed a hydrogen bomb, and would use it to "defend its sovereignty and the dignity of the nation." If true, it would mark a major step up from less powerful atomic bombs, which the isolated communist nation tested in 2006, 2009 and 2013. South Korean intelligence specialists dismissed the claim, however. "We do not believe that North Korea, which has not succeeded in miniaturizing nuclear bombs, has the technology to produce an H-bomb," Yonhap News Agency quoted an unnamed intelligence official as saying.
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