GENEVA — A U.S. official focusing on arms control on Monday provided what he called new, declassified details of a Chinese underground nuclear test nearly six years ago and urged countries to press ...

Trump ordered the Pentagon to restart nuclear testing for the first time since 1992, citing rival nations’ actions. Trump’s claim that the U.S. has the largest arsenal contradicts data showing Russia ...

More has come out on President Donald Trump's plans for nuclear testing, from top officials and from Trump himself, but it's still unclear exactly what's coming. Trump wrote in a Truth Social post on ...

The head of the organization overseeing a treaty banning nuclear testing is warning that if the United States, Russia or any other nation goes ahead with a test, other nations will follow.

Earlier this month, the New START treaty, a strategic-arms reduction agreement between Russia and the United States to limit their nuclear arsenal, expired. That accord was the last in a series of ...

US intelligence agencies believe that China is developing a new generation of nuclear weapons and has conducted at least one covert explosive test in recent years as part of a broader push to ...

See more of our coverage in your search results. Add The New York Post on Google US intelligence agencies believe China is developing a “new generation” of nuclear weapons — with Beijing having ...

A recently uncovered British government paper provides evidence of a 70-year official cover-up of the consequences of the United Kingdom’s thermonuclear tests in the Pacific after World War II. London ...