The international community has been trying to stop North Korea from developing long-range missiles for decades. So how did North Korea get them?
Soot thrown into the atmosphere would block out the sun, causing crops to fail and people to go hungry.
The most viable nonmilitary solution to the standoff with North Korea is to get China to apply pressure. But that's not so easy.
South Korea has a very particular part to play in handling Pyongyang, but Moon Jae-in has a different one in mind.
While some countries were taking a major step toward the elimination of nuclear weapons, the US and its allies were focusing on ineffective, counter-productive sanctions against North Korea.
North and South Korea explained in four questions and answers.
Pyongyang's latest missile test sparked a surprising reaction from the Russian leader.
An aggressive neighbor to the north, a sputtering economy at home – and two more thorny issues facing South Korea's new president.
Regardless of how the US sending an aircraft carrier group to the Korean Peninsula plays out, the international community will ultimately have to accept and learn to manage a nuclear North Korea.
Talks begin today at the United Nations to negotiate a total ban of nuclear weapons. Over 3,600 scientists have signed an open letter supporting the ban.
The use of nuclear weapons – arguably the most devastating of all weapons of mass destruction – is currently not necessarily prohibited under international law.
Tensions in Asia may soon boil over. If U.S. leaders fail to seek pathways to peace, the consequences may be grim, warns former National Security Council member.
Claims of the destructive powers of nuclear weapons have, for good reasons, been greatly exaggerated.
Nuclear power was a cornerstone of Japan's energy strategy for decades, until the Fukushima disaster. The current government wants to keep some nuclear reactors open, but has lost public support.
Sanctions and warnings have failed to stop Pyongyang's belligerence.
People have been rising up against nuclear weapons ever since the first one was used – and it hasn't been for nothing.
The country plays by different rules.
A useful avatar for threats both real and perceived, the notion of a pan-Islamic nuclear weapon has little to do with reality.
Nuclear bunkers are familiar Cold War artefacts, but many have been re-purposed or lie derelict.
Beijing has traditionally retained its nuclear weapons on a no-first-use basis, but it's ready to deploy them more assertively.