SEOUL, South Korea — North Korea’s declaration that it had tested a hydrogen bomb for the first time was greeted with widespread condemnation — but also skepticism — as world powers vowed Wednesday to ...

A successful H-bomb test would be a big advance in North Korea's nuclear weapons program. Fusion is the main principle behind the hydrogen bomb, which can be hundreds of times more powerful than ...

SEOUL, South Korea -- North Korea says it has conducted a hydrogen bomb test. The surprise announcement that complicates already difficult efforts to curb the country's push for a working nuclear ...

The compact, liquid-fuelled ramjet engine uses a novel combustion technology called rotating detonation that offers ...

TOKYO (AP) — North Korea says it successfully detonated a hydrogen bomb in its latest nuclear test Sunday. Outside experts haven't been able to verify that claim, but say it's plausible. If true, it ...