Leader Kim Jong Un pledged to pursue "sustained countermeasures," citing security ties between the U.S. and its regional allies.

Join us as we welcome Hui Zhang, Senior Researcher in Project on Managing the Atom, to talk about his upcoming book.

It’s a pivotal moment for nuclear weapons. Tensions between the United States and Russia, the two major nuclear powers, are high. Longstanding nuclear pacts have crumbled. China, which trails ...

North Korea said on Saturday its nuclear weapons are not meant for negotiations but are intended for combat use against ...

U.S. concerns about Iran developing nuclear weapons are not a complicated issue and can be resolved given Tehran's opposition ...

said the U.S. cannot build more nuclear weapons than Russia and China (and its "gigantic economy") in the decades to come, despite an ongoing $1.7 trillion nuclear arsenal modernization plan.