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The U.N. nuclear watchdog raised pressure on Iran to finally address suspicions that it has sought to design an atomic bomb, calling for swift inspector access to a military base where relevant explosives tests are believed to have been carried out.

Lyse Doucet assesses Iran's change in tactics at the latest nuclear talks in Almaty, Kazakhstan.

Iran said on Wednesday it had started installing a new generation of machines for enriching uranium, an announcement likely to annoy the West and complicate efforts to resolve a decade-old dispute over its nuclear program.

North Korea apparently conducted a widely anticipated nuclear test Tuesday, strongly indicated by an "explosion-like" earthquake that monitoring agencies around the globe said appeared to be unnatural.Click to Continue »

It remains unclear just when, if ever, North Korea will attempt their controversial third nuclear test, but there are growing signs that the reclusive nation's biggest political ally is growing weary of its behavior.

The U.N. Security Council is united on North Korea's nuclear arms program and will undoubtedly approve tough measures against Pyongyang if it carries out a new atomic test as expected, South Korean U.N. Ambassador Kim Sook said on Monday.

North Korea's missile tests and menacing rhetoric have disappointed U.S. expectations that young leader Kim Jong-un would be different than his father but Washington still hopes to persuade Pyongyang to change course, Secretary of State Hillary Clinton said on Tuesday.

North Korea has confirmed its intention to carry out a third nuclear test, saying it is the “demand of the people.” It comes after the UN tightened sanctions against the regime, following its December long-range rocket launch. "The people's demand is that we must do something even greater than a nuclear test. The United Nations Security Council has left us with no other options. We have no other ways but to push forward to the final showdown," Rodong Sinmun, the official daily newspaper of the ruling communist party, wrote in a commentary on Saturday.

China's apparent decision not to block expanded United Nations sanctions against North Korea for its satellite-cum-missile launch last month is good, if mysterious, news. Good, because China has traditionally resisted punishing North Korea for its misdeeds, arguing that engagement is more likely to bring results. Mysterious, because its reasons for changing its mind could be manifold.

North Korea is warning that it will strengthen its military and nuclear defenses in reaction to what it calls U.S. hostility toward Pyongyang....