US President-elect Donald Trump has promised everything. But what does he stand for? These are his key policies.

Canadian man goes diving for sea cucumbers, stumbles across missing US nuclear weapon.

Whether you're a superpower or a lone wolf, there have never been more deadly weapons available at any time in the world than right now.

US President Barack Obama has urged world leaders to do more to safeguard vulnerable nuclear facilities to prevent "madmen" from groups like Isis.

Mike Hosking says when it comes down to it, what country is a genuine nuclear threat right now? This doom and gloom attitude needs to stop.

For any rational military strategist, the risks of an armed response to North Korea's sanctions violations and pin-prick provocations are prohibitive, writes Benjamin Habib.

North Korea may have explained its announced hydrogen bomb test as a response to US "hostility", but experts say it may more accurately reflect deteriorating relations with China.

The crowd sat entranced as 78-year-old Emiko Okada recalled the horrifying events of August 6, 1945, a day that started hot and cloudless.

Seventy years after Hiroshima and Nagasaki, New Zealand must take the lead on banning lethal weapons, writes Dita De Boni.

If there is one event that defines the modern world, it is the blinding, searing, radioactive explosion over the city of Hiroshima 70 years ago today.

Seventy years on, the feared nuclear Armageddon has been kept in check - but a new threat is mounting, writes Alexander Gillespie.

President Barack Obama has challenged his critics at home and abroad to back the Iran nuclear deal.

The deal to curb Iran's nuclear weapons programme came at the end of two years of an intricate ballet, involving United States President Barack Obama and leaders of six other countries.

Murray McCully said today the nuclear deal between Iran and six major powers was an “important” breakthrough.

Secretary of State John Kerry said yesterday the United States and its negotiating partners "will not rush, and we will not be rushed" into finalising a nuclear deal with Iran.

The world's largest nuclear meeting, the five-yearly Review Conference of the nuclear Non-Proliferation Treaty (NPT), has just closed at the United Nations headquarters in New York.

Pakistan has test-fired a ballistic missile able to carry a nuclear warhead to every part of India. Yesterday's test was another escalation in Islamabad's effort to keep pace with its neighbouring rival's formidable military advancements.

Veterans of British nuclear tests in the mid-Pacific in the 1950s, including New Zealand servicemen, have taken heart from a first victory in their long fight for compensation for illnesses linked to radioactive fallout.

US Secretary of State John Kerry says he knows New Zealand stands with America on Iraq - and he doesn’t need to ask to know that.

US Secretary of State John Kerry used a reception at the NZ embassy in Washington last night to pointedly promote US nuclear-powered warships as safe.

The US nuclear test at Bikini Atoll in the Marshall Islands on March 1, 1954, was 1000 times larger than the bombs that obliterated Hiroshima and Nagasaki.

Serving world leaders their lunch is a serious affair. No room for "blondes" or women in dresses then, it appears.

Mexican nuclear official have said a stolen container of radioactive material has been found empty.

Saudi Arabia dislikes the deal the West has cut with Iran for two reasons.

Responding to his critics, President Barack Obama forcefully defended the nuclear agreement with Iran, declaring that the United States "cannot close the door on diplomacy."

Editorial: Viewed against a background of the long-standing enmity between Iran and the West, the nuclear deal signed with Tehran is a stunning achievement.

New Zealand has welcomed the agreement reached in Geneva yesterday aimed at capping Iran's nuclear programme.

Iran has struck a historic nuclear deal with the US and five other world powers, after more than three decades of estrangement,