North Korean develop hydrogen bomb capability

Kim jong hinted  a major step forward in its nuclear weapons
capabilities A hydrogen, or thermonuclear device, uses fusion in a chain reaction that results in a far more powerful explosion.  During a recent inspection tour of a historical military site, Kim mentioned that North Korea was already a "powerful nuclear weapons state ready to detonate self-reliant A-bomb and H-bomb to reliably defend its sovereignty the North Korea official  news agency said on Thursday. It has already tested three atom bombs, which rely on nuclear fission. North Korea has hinted before at the possession of "stronger, more powerful" weapons, but Kim's remarks were believed to be the first direct reference to an H-bomb. The North has made many unverifiable claims about its nuclear weapons strength, including the ability to strike the US mainland which most experts dismiss — at least for now. In September, the Washington-based Institute for Science and International Security (ISIS) had raised a red flag over what appeared to be a new "hot cell" facility under construction at the North Korea's main Yongbyon nuclear complex

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