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Nearly 2,000 metric tons of dangerous nuclear materials remain spread across hundreds of sites around the globe — some of it poorly secured.

Nations around the globe have taken important steps over the past two years to safeguard nuclear weapons materials from potential thefts by terrorists, an expert Washington-based group concluded Jan. 8 in a comprehensive report. Read more»

A target missile blasts off from Kodiak Island, Alaska, for a tracking test involving radars and sensors on Feb. 24, 2006.

The Pentagon is repeatedly taking risks by using old or untested missile parts, and paying hundreds of millions of dollars in extra costs Read more»

Kim Jong-un

Five questions with MIT professor Jim Walsh on what North Korea's nuclear detonation means for China, the US and global security. Read more»

A UGM-96 Trident missile clears the water during the 20th demonstration and shakedown launch from the nuclear-powered strategic missile submarine USS Mariano G. Vallejo

The Pentagon’s budget is almost assuredly going down in coming years, but it looks like a specific type of weaponry, the nation’s stockpile of nuclear warheads, is also headed down, with Barack Obama’s reelection. Read more»

Iran's currency, the rial, has lost 80 percent of its value in the last 10 months as a result of Western economic sanctions.

With the third and final presidential debate on Monday night focused on foreign policy, Iran once again took center stage. Read more»

The Titan II missile museum is located just south of Tucson.

A treaty signed by President Obama and Russian President Dmitri Medvedev in Prague on Thursday would trim the two power’s strategic nuclear arsenals to their lowest levels in half a century. Read more»