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 United States said Tuesday that Russia was not complying with New START, the last remaining arms control treaty between ...

This marks the first time that the U.S. has accused Russia of violating the treaty, which entered into force in 2011.

Russia's refusal to allow on-the-ground inspections to resume is endangering the New START nuclear treaty and U.S.-Russian arms control overall, the Biden administration charged on Tuesday.

Russia wants to sit down with Pentagon officials for “open and specific” talks on alleged violations of the Intermediate-Range Nuclear Forces treaty, the Russian Defense Ministry said Saturday.

"Russia's refusal to facilitate inspection activities prevents the United States from exercising important rights under the ...

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.

(Photo by Galerie Bilderwelt via Getty Images) One of the more likely scenarios discussed is Russia firing a so-called tactical nuclear ... the United States committing unilaterally to disarmament ...

said a military defeat for Russia in Ukraine could spark a nuclear war. Kommersant Photo / Polaris While multiple countries, including the US, Germany and France, have committed in recent weeks to ...

The U.S. General said Russia will likely launch nuclear warheads if Ukraine threatens to retake Crimea Brig. Gen. Ryan said a Russian nuclear strike would cause tens of thousands of deaths Russia ...

the Russian Foreign Ministry statement on Monday said that the talks between the foreign ministers of Russia and Iran were postponed after both diplomats agreed. According to the Russian news agency, ...

A Russian hacking team known as Cold River targeted three nuclear research laboratories in the United States this past summer, according to internet records reviewed by Reuters and five ...