Iran said Monday that its stockpile of enriched uranium will surpass limits set by the 2015 international nuclear deal 10 days from now.
North Korea fired two suspected short-range missiles on Thursday. The launch was a possible warning that missile talks with Washington could be in danger.
India and Pakistan: Scholars disagree about whether nuclear weapons stabilize or destabilize relations between adversaries.
Russian President Vladimir Putin said that his country's new missiles would point toward the United States if Washington deploys missiles in Europe.
This may be the first time in history that a major military power has elected not to invest in extensive defenses against the biggest threat to its survival.
Activists asked a judge to make documents public from a 27-year-old criminal investigation into a former nuclear weapons plant with a history of fires, leaks and spills.
U.S. Secretary of State Mike Pompeo urged the U.N. Security Council to again ban Iranian ballistic missiles capable of delivering nuclear weapons.
Russia is calling U.S. accusations that it isn't complying with a 1987 nuclear weapons treaty "groundless" and says its claims of U.S. violations of the Intermediate-Range Nuclear Forces Treaty are "justified."
South Korea government officials estimate that the size of North Korea's nuclear arsenal ranges from at least 20 bombs to as many as 60.