A U.S. official focusing on arms control has provided what he called new, declassified details of a Chinese underground ...

In a move that sent tremors through the global security landscape, the United States, in February 2026, publicly accused ...

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 ...

While China is expanding its nuclear arsenal at a dramatic pace, Russia and the U.S. are also testing new delivery platforms.

Add Yahoo as a preferred source to see more of our stories on Google. The end of the New START treaty means Russia and the United States are no longer restricted in the number of nuclear warheads they ...

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

Seismic data points to a detonation in northwest China, U.S. says.

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

America’s last nuclear detonation was nothing special. Smaller than the bomb that killed 73,000 people in Nagasaki, it exploded 1,397 feet below the Nevada desert. It shook the ground, created a ...

Add Yahoo as a preferred source to see more of our stories on Google. People perform for North Korean leader Kim Jong Un during a celebration for nuclear scientists and engineers who contributed to a ...