The February 28 attacks follow Iran's rapid buildup of near-weapons-grade uranium and the collapse of recent indirect talks, with Donald Trump vowing to prevent Tehran from acquiring a nuclear bomb \"at all costs.

A US official says a seismic station in Kazakhstan collected evidence of an alleged China nuclear test at Lop Nur in June 2020.

The United States has revealed new details about a Chinese underground nuclear test that it claims happened nearly six years ago. The disclosure comes as tensions rise over global nuclear arsenals following the expiration of the last major nuclear arms pact between the United States and Russia.

The allegations were leveled by U.S. officials late last week. Arms control experts worry that norms against nuclear testing are unraveling.

Scientific knowledge about the damaging effects of nuclear-weapons testing helped to end such tests. Those findings haven’t changed.

Nuclear weapons tests are among the most violent events humans can trigger, and that violence leaves fingerprints in the Earth, sea, air, and even in orbit. The physics of shock waves, sound, and radioactive decay means that a nuclear blast is not just a ...

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 completely transform its nuclear arsenal into the world’s most technologically advanced,

When PolitiFact asked the White House to square Trump’s remarks about obliteration with Witkoff’s comment about Iran being a week away from having bomb making material, the White House referred us to press secretary Karoline Leavitt’s Feb. 24 remarks.