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The five countries that the Nuclear Nonproliferation Treaty (NPT) recognizes as nuclear-weapon states last month “expressed their shared disappointment” that the Conference on Disarmament (CD) has not agreed to negotiate an international ban on the production of fissile material for use in nuclear weapons and “reiterated their support for the immediate start of negotiations” in the CD.

In the wake of national security adviser Tom Donilon’s visit to Moscow, the United States and Russia plan to resume talks on missile defense cooperation after a two-year break.

The proposal that six world powers brought to negotiations with Iran over its nuclear program contains transparency elements that would require Tehran to address allegations of possible activities related to making a nuclear bomb, sources said.

The proposal that six world powers brought to negotiations with Iran over its nuclear program contains transparency elements that would require Tehran to address allegations of possible activities related to making a nuclear bomb, sources said.

The Obama administration is planning to slow down—and perhaps eventually stop—construction of the facility that is the centerpiece of the U.S. effort to get rid of plutonium withdrawn from its nuclear weapons program.

The U.S. intelligence community has tentatively concluded that the Syrian government used chemical weapons against its own people, but is seeking further evidence.

The Obama administration is seeking funding increases for its plan to extend the life of B61 bombs, as well as other nuclear force modernization projects, but a key senator is raising questions.