Some U.S. intelligence analysts now believe that North Korea "probably" possesses a miniaturized nuclear warhead, several U.S. officials told CNN. The assessment has yet to become a formal consensus view of the U.S. government. But it reveals just how far along many in the U.S. believe the reclusive country has come to gaining a nuclear-tipped ballistic missile that could potentially strike the U.S.

North Korea successfully tested a solid-fuel engine that boosted the power of its ballistic rockets, state media reported on Thursday, as South Korea's president ordered the military to be ready to respond to the North's "reckless provocation". Pyongyang's claim indicates it is continuing to develop an intercontinental ballistic missile (ICBM) at a rapid pace in defiance of U.N. sanctions, and amid assessment by the South's officials that it could conduct a new nuclear test at any time.

A U.S. official has told CNN that Iran has the ability to launch a three-stage rocket with a satellite on top "at any minute." It would be Iran's first ever launch of this configuration, and like the North Korean test earlier this year, would give Iran further insights into intercontinental ballistic missile technology. The assessment followed reports in Iran's state media that it had test-fired two ballistic missiles last Wednesday.

Kim Jong-un has said North Korea will soon conduct tests of nuclear warheads and ballistic missiles. He said the tests would "enhance the reliance" of the North's nuclear attack capability, state media reported. The North has issued a series of increasingly bellicose threats in the wake of sanctions imposed after nuclear and missile tests earlier this year. But though it is known to have nuclear weapons, many analysts...

Russia has warned North Korea that threats to deliver “preventive nuclear strikes” could create a legal basis for the use of military force against the country, suggesting that even Pyongyang’s few remaining friends are growing concerned about its increasingly confrontational stance. The Russian foreign ministry statement, which follows a North Korean threat to “annihilate” the US and South Korea, also criticises Washington and Seoul...

President Obama has made his share of foreign policy mistakes, particularly in the Middle East. But it’s ironic that Republican critics now hammer him hardest over his nuclear deal with Iran, a bet that has already paid out for those who want to undermine Iran’s hard-liners. Elections for Iran’s parliament and its Assembly of Experts–which picks the nation’s Supreme Leader–were hardly free and fair. Conservatives managed to block..

These clips are from shot Grable, the Atomic Cannon test in 1953 showing the initial burst and shockwave. Identified also are the various vehicles on the desert floor which are very, very tiny compared to the fireball of the blast. There are cars, jeeps, buses and tanks under the blast area. I have put a title over a frozen frame to be able to see the positions of the vehicles. Can anyone find the bird?

Thousands have marched through London to oppose the renewal of Britain's Trident nuclear weapons system in what demonstrators describe as the biggest such rally in a generation. Waving placards and banners, the protesters offered their opposition Saturday ahead of a final government decision on whether to replace the current generation of submarines that carry the nuclear warheads.

Her first clue that something was wrong came as she ran her hands through her baby boy’s hair. “My child was losing his hair in clumps,” Meagan Beckermann recalls. A doctor traced the problem to alopecia areata, an autoimmune disease that can be triggered by environmental factors.

The story has been covered extensively in Germany and even in Israel, but it seems to have largely escaped notice in the United States: Israel has acquired a fleet of advanced German submarines that—Prime Minister Netanyahu has signaled—carry nuclear weapons pointed at Iran. The Obama administration’s pretense that it knows nothing about any nuclear weapons in Israel makes intelligent discussion about the dangers of nuclear weapons...

US imposes sanctions on Iranian companies and individuals over a ballistic missile programme, hours after international nuclear sanctions were lifted.

International sanctions on Iran are lifted after its compliance with obligations under the nuclear agreement with world powers was certified.

A new book collects their business cards in all their well-designed detail.

North Korea said Tuesday its nuclear test was not intended to be a provocation or threat, as it laid out plans for a weapons system capable of obliterating the entire United States. A lengthy commentary by the official KCNA news agency underlined the North's claim that last Wednesday's test was of a powerful miniaturised hydrogen bomb which marked a "new high stage" in the country's search for a credible nuclear deterrent.

A 5.1 magnitude tremor is detected in North Korea, close to a site previously used to conduct nuclear tests.

Nobel Prize-winning physicist Enrico Fermi, the first man to create and control a nuclear chain reaction, and one of the Manhattan Project scientists, dies in Chicago at the age of 53.

"Let's play Global Thermonuclear War." Thirty-two years ago, just months after the release of the movie WarGames, the world came the closest it ever has to nuclear Armageddon. In the movie version of a global near-death experience, a teenage hacker messing around with an artificial intelligence program that just happened to control the American nuclear missile force unleashes chaos. In reality, a very different computer program run by the Soviets fed growing paranoia...

The United States has confirmed that Iran tested a medium-range missile capable of delivering a nuclear weapon, in "clear violation" of a United Nations Security Council ban on ballistic missile tests, a senior U.S. official said on Friday. "The United States is deeply concerned about Iran's recent ballistic missile launch," the U.S. ambassador to the United Nations, Samantha Power, said in a statement.

White House spokesman Josh Earnest said on Tuesday that there are "strong indications" that Iran's test of a new precision-guided ballistic missile on Sunday violated a U.N. Security Council resolution. The U.N. Security Council prohibits Iran from undertaking any activity related to ballistic missiles that could deliver a nuclear warhead, but Iranian officials have pledged to ignore the ban.

Iran tested a new precision-guided ballistic missile on Sunday in defiance of a United Nations ban, signaling an apparent advance in Iranian attempts to improve the accuracy of its missile arsenal. The Islamic Republic has one of the largest missile programs in the Middle East, but its potential effectiveness has been limited by poor accuracy.