A recent study discovered something unexpected: The US military's confidence in the president having sole authority to launch a nuclear weapon went down when Trump authorized missile strikes on Iran.

The nuclear weapons today are far more powerful than the atomic bomb 80 years ago. We all would feel a lot better if there was a sustained effort at nuclear arms control and disarmament.

Some suggested it might be a good idea for some countries to get nuclear weapons; for instance, an Indian bomb might deter China from aggression in South Asia.

Nuclear weapons, however, have never completely deterred war between nuclear powers. The political scientist Robert Powell’s game theory model of conventional war and nuclear escalation, for example, ...

On July 3, China’s foreign ministry signaled that Beijing would sign the protocol to the Southeast Asia Nuclear Weapon-Free Zone Treaty, or Bangkok Treaty of 1995. Russia is also ready to ink ...

Iran’s nuclear program and delivery capabilities spark global fears, as experts question their intentions and urge vigilance.

Will U.S. bombs deter Iran from pursuing a nuclear weapon, or persuade it that only a nuclear weapon will deter more U.S. bombs?

Iran's stockpile of uranium enriched at 60 percent would be enough to make several relatively unsophisticated nuclear weapons. So why does nobody talk about it?

Bipartisan lawmakers propose transfer of B-2 bombers and bunker buster bombs to Israel if Iran continues nuclear weapon development after recent U.S. strikes.

Iran has a long history of enriching uranium in an effort to develop nuclear weapons. It’s not clear how far the US attack set back Iran’s production of bomb-grade uranium.