Barack Obama and Shinzō Abe at the Hiroshima Peace Memorial.
Speaking at the Hiroshima Peace Memorial, Barack Obama sounded a hopeful note – but both the US and Japan still fall short.
President Barack Obama and Japanese Prime Minister Shinzo Abe at Hiroshima Peace Memorial Park.
Two prominent MIT physicists ask whether for nuclear weapons, less is more
Watch and learn.
A rare glimpse of North Korea's political strategy offers no earth-shattering revelations, but clears up a lot of unanswered questions.
Rouhani and Renzi meet in Rome.
The most difficult aspect of trade in "post-sanctions" Tehran, is how to navigate the sanctions still in place.
The Republican insurgent's latest foray into geopolitics was even more dangerous than it sounded.
Ready for war: American and South Korean soldiers in April 2016.
Only 16 percent of Americans see North Korea as the US' "greatest enemy." Here's why that percentage should be much bigger.
Huge dirty bomb exercise in Portland, US.
AP Photo/Rick Bowmer
Dirty bombs are relatively easy for a terrorist organisation to make. So how do we tackle the threat?
The policy failures behind the upbeat headlines.
Some things never change, it seems. For my entire life people have been protesting about the madness of nuclear weapons. Policymakers have been studiously ignoring such protests for just as long. Not only…
To international condemnation and beyond!
Why is it so hard to imagine that North Korea might have perfectly sane reasons for going into space?
Limited centrifuge operations: Iran’s Natanz enrichment facility.
(File photo from 2008.)
How can the international community be sure Iran is living up to its end of the new nuclear deal?
Ben Birchall/PA Wire
Laugh at Jeremy Corbyn all you like, but he's right: nuclear deterrence isn't a zero-sum game.
Negotiations between members of the United Nations Command and North Korean counterparts in 2013.
U.S. forces in South Korea are on high alert after North Korea claimed to have tested a hydrogen bomb last week. But China may be better positioned to curb North Korea's menacing behavior.
If this detonation was a hydrogen bomb test, then it was likely less successful than the North Korean leadership may have hoped.
North Korea remains committed to perfecting a deployable nuclear weapon capability. It is confident in the understanding that there appears little the international community can do to prevent it.
South Koreans were shaken by news of the North’s underground test.
North Korea has been signalling an uptick in its nuclear programme for a while – and its strategy is as clear as ever.
What are the implications of North Korea's claims to have detonated a thermonuclear weapon?
Warm relations: Reagan and Gorbachev at the 1985 summit in Geneva.
US National Archives
30 years ago, Reagan and Gorbachev ushered in a new era of cordial relations. It's time to recapture that spirit.
British chief of defence staff did cross the line when discussing the nuclear option.
A petrochemical complex on Iran’s Persian Gulf coast.
The merest hint of a successful deal over Iran’s nuclear programme is enough to get people excited. And as the country emerges from economic isolation, nowhere is the enthusiasm more keenly felt than in…
Korean War-era weapons on display in South Korea. More than six decades on, tensions are unresolved – and now they are nuclear.
The West has long depended on the nuclear deterrent to quell the threat of 'rogue' nations like North Korea. But Pyongyang's continued nuclear weapons program shows that global disarmament is the only answer.