SEOUL, South Korea — North Korea carried out its sixth and most powerful nuclear test early Sunday in an extraordinary show of defiance against President Donald Trump, who responded by declaring the ...

In northwest North Korea, Mount Mantap became the center of the country’s nuclear testing program between 2006 and 2017, when six underground detonations were carried out beneath the mountain. The ...

“If this H-bomb were to be mounted on an intercontinental ballistic missile and fall on Manhattan in New York City, all the people there would be killed immediately and the city would burn down to ...

North Korea on Thursday said its testing spree this week involved various new weapons systems, including ballistic missiles armed with cluster-bomb warheads, as it pushes to expand nuclear-capable ...

BEIJING (Reuters) - British Foreign Secretary Philip Hammond said on Wednesday a test of a hydrogen nuclear bomb by North Korea would be a "provocation which I condemn without reservation" and a ...