Iran’s Ayatollah Ali Khamenei said Tehran should not give up core elements of its atomic programme until allegations of past military dimensions had been settled. Photograph: Reuters

Supreme Leader Ayatollah Ali Khamenei on Wednesday approved the Iranian government’s nuclear deal with world powers but said Tehran should not give up(...)

Tepco workers standing before the stricken Fukushima Daiichi nuclear power plant on February 28th, 2012. Photograph: Yoshikazu Tsuno/AFP/Getty Images

David McNeill in Tokyo The Japanese government says it has agreed to compensate a man who contracted leukemia while working at the Fukushima Daiichi n(...)

US president Barack Obama. “I hereby direct you to take all necessary steps to give effect to the US commitments with respect to sanctions” on Iran. Photograph: Zach Gibson/The New York Times

The United States approved conditional sanctions waivers for Iran on Sunday, though it cautioned that they would not take effect until Tehran has curb(...)


Smoke was still billowing from the site of two devastating explosions in the northeastern Chinese port of Tianjin early on Friday, as relatives contin(...)

Barrack Obama during a news conference in Addis Ababa, Ethiopia, today. Photograph: STR/EPA

President Barack Obama has lashed out at Republican presidential candidates for making what he called “ridiculous” claims about his policies and “outr(...)

The nuclear agreement signed yesterday between Iran and the five permanent members of the UN Security Council plus Germany and the EU is a landmark pi(...)

An Iranian security guard stands as US secretary of state John Kerry meets the Iranian delegation including foreign minister Mohammad Javad Zarif at a hotel in Vienna where the  nuclear talks meetings are being held. Photograph:  Carlos Barria/Reuters

Tehran and world powers were still shy of a breakthrough at nuclear talks yesterday as foreign ministers flew in to lend heft to negotiations that foc(...)

US secretary of state John Kerry leans his crutches on a table before delivering his statement on Cuba outside the hotel where the Iran nuclear talks meetings are being held in Vienna, Austria. Photograph: Carlos Barria/AFP/Getty Images

The global nuclear watchdog has said its head would fly to Tehran to discuss some of the last big issues that need to be resolved so that Iran and wor(...)

Since Stuxnet’s exposure in 2010, 20 countries have announced digital warfare programmes

The Stuxnet computer worm temporarily succeeded in its goal of crippling Iran’s controversial uranium enrichment programme but, as the world’s first d(...)

By any standards the late Fr Theodore (Ted) Hesburgh, who has died aged 97, was an extraordinary Irish American. With a score of 150, he held the Guin(...)