A senior U.S. defense official last week voiced confidence in a newly defined "reuse" approach to modernizing nuclear warheads that some scientists have called into doubt.

A new nuclear arms control treaty signed by the United States and Russia in April would not limit future U.S. plans for missile defense, key military brass said yesterday

Russian Prime Minister Vladimir Putin has approved an initiative to improve the testing capacity for the nation's nuclear arsenal.

Burma has begun secretly acquiring key components for a nuclear weapons program, including specialized equipment used to make uranium metal for nuclear bombs, according to a report that cites documents and photos from a Burmese army officer who recently fled the country.

With an eye toward making good on U.S. President Barack Obama's nearly year-old pledge to reduce the role of nuclear weapons in U.S. national security, some of his top lieutenants have begun asserting that technological advances now allow greater reliance on conventional arms for strategic deterrence.

Leading British and U.S. science organizations are calling for a stepped-up campaign of scientific cooperation to help lay the groundwork for global nuclear disarmament.

President Obama persuaded 46 countries to sign on to a plan to put the world's nuclear material beyond the reach of terrorists within four years, but the commitments are voluntary, and experts said reaching the goal will be difficult.

Joseph Cirincione argues that the Pentagon's plans for "Prompt Global Strike" through a modified space plane, are expensive, unnecessary, and insanely dangerous.

President Barack Obama’s signing of a nuclear arms reduction treaty with Russian President Dmitry Medvedev took so long to conclude it has jeopardized Obama's chances to achieve another nuclear goal: Senate ratification of a nuclear test ban treaty.

As the White House pushes for cuts in the U.S. nuclear arsenal, the Pentagon is developing a weapon to help fill the gap: missiles armed with conventional warheads that could strike anywhere in the world in less than an hour.