Russia has refused to reschedule a key meeting with U.S. nuclear negotiators that it canceled in November, a U.S. diplomat said on Tuesday, further delaying efforts to replace an expiring nuclear ...

The U.S. State Department on Tuesday told Congress that Russia has violated the New START Treaty that allows for inspections ...

Russia said on Monday that no new date had been set for talks with the United States on the New START nuclear arms treaty, accusing the U.S. of ramping up tensions between the two sides. Talks between ...

The finding follows more hopeful U.S. assessments that the countries would be able to salvage cooperation on limiting nuclear weapons despite tensions over Russia’s war on Ukraine.

Delegates from Russia attend the Nuclear Non-Proliferation Treaty review conference in New York City, New York, U.S., August ...

The treaty allows five of them—the United States, the United Kingdom, Russia, China, and France—to possess nuclear weapons. But it also requires those five to pursue full nuclear disarmament.

By Michael Callahan, Jennifer Hansler, Haley Britzky and Kylie Atwood, CNN Russia is violating a key nuclear arms control agreement with the United States and continuing to refuse to allow inspections ...

Gottemoeller had been involved in nuclear disarmament talks with Russia. She said that mutual predictability between the United States and China will be necessary. But she added that it is ...

an effort to harness the power of nuclear fusion to unleash vast amounts of clean energy — continues to purr along with the participation of Russian scientists and Russian technology. Earlier this ...

Risks to non-proliferation were dealt a blow as talks ... Nuclear Weapon-Free Zone. Meanwhile, Russia has backtracked somewhat from its nuclear threats, avoiding further escalation and affording ...

North Korea’s spike in missile testing and development of its nuclear program has prompted South Korea to re-evaluate its defense capabilities, including the potential development of a nuclear ...

The Nuclear Non-Proliferation Treaty, which has served as the norm for promoting nuclear disarmament and preventing ... Only five countries--the United States, Russia, Britain, France and China ...