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.
On the march again.
The restart of a North Korean nuclear facility has sent shockwave around the world. Why is it happening now?
Not all of Iran’s frozen foreign assets are likely to thaw anytime soon.
Frozen dollar via www.shutterstock.com
Estimates of how much of Iran's frozen assets it will get once sanctions are lifted vary widely, but the sum is most likely just a fraction of the total.
The Arak heavy-water reactor has been at the center of concerns about potential Iranian nuclear proliferation.
Critics of the nuclear deal with Iran have good reasons to be skeptical, but blocking the deal would make the United States and its allies less secure.
Possession of a nuclear deterrent has helped prevent recurrent conflict between South Asia's two warring powers.
Atomic cloud over Hiroshima.
By 509th Operations Group via Wikimedia Commons
Any nuclear weapon exchange or major nuclear plant meltdown will immediately lead to a global public health emergency. What can we learn from past events to help prepare?
The average age of survivors is now 80. In five years, very few of these first-hand witnesses will be around to remember the event. Many of their stories are in danger of being lost forever.
The Museum of Science and Industry in Hiroshima, August 1945.
Everett Historical / Shutterstock.com
John Hersey's article Hiroshima (1946) is seminal in historical and literary terms: the shocking realities of the atomic bomb demanded a new way of writing.
On August 6, 1945, a crude bomb containing 60 kilograms of highly enriched uranium exploded 580 metres above Hiroshima.
EPA/Hiroshima Peace Memorial Museum
Today's nuclear arsenals are so powerful that dropping a Hiroshima-size bomb every two hours for 70 years would not exhaust their destructive capacity. The global disarmament regime is broken.
US Dept of Energy, via Wikimedia Commons
The way we judge nuclear risk isn't just a rational calculation – it's a reflection of much deeper biases.
Brazil’s former president, Jose Sarney.
EPA/Fernando Bizzerra Jr
Latin America's two biggest players spent much of the 1980s in a low-grade arms race – and they both had nuclear aspirations. How did they manage to diffuse the tension?
Blowing up the desert – and people’s minds: the first atom bomb test in 1945.
The first atom bomb test seventy years ago today marks the start of a change in Americans' thinking about radiation. On balance, our nuclear anxieties endure today.
Increased oil and gas revenues amid lifted sanctions are set to raise Iran’s economic fortunes, which ease Middle Eastern tensions.
EPA/Abedin Taherkenareh/AAP Image
Opponents of the Iran nuclear deal say it raises the nuclear weapons threat in the region. But Middle East tensions are actually likely to ease as Iran grows richer without being shackled by sanctions.
As it moved from the edge of the global order to the top of the heap, China realised it needed a nuclear arsenal to be taken seriously.
Taking a look at Iran’s Bushehr nuclear plant.
Iran's path back to nuclear acceptability is now set out. Let the real work begin.
Walking in sync.
A scholars' panel looks at the diplomacy, the science and the pragmatism behind the Joint Comprehensive Plan of Action signed between Iran and six world powers.