For nearly eight years, North Korea has not announced another nuclear test at Mount Mantap. But the ground beneath the ...

A mounting standoff over allegations of covert Chinese nuclear testing and rapid arsenal expansion has collided with an intensifying domestic debate ...

After the atomic bombings of Hiroshima and Nagasaki demonstrated the power of nuclear weapons, the Soviet Union accelerated a secret program to close the growing technological gap with the United ...

Thirty years ago today, President Bill Clinton signed the Comprehensive Nuclear Test Ban Treaty (CTBT). The treaty bars ...

Unexpected, prolonged seismic activity has been detected around North Korea's Punggye-ri nuclear test site, notably after the ...

The United States has accused China of conducting a covert nuclear explosive test in 2020, a charge that lands at a moment when the last major arms control agreements are fraying. The allegation, ...

President Donald Trump has directed the Pentagon to resume testing nuclear weapons after a 33-year pause, announcing the move on social media just ahead of meeting Chinese President Xi Jinping in ...

For decades, the United States’ nuclear weapons enterprise has wrestled with an institutional paradox. On one hand is the ...

Add Yahoo as a preferred source to see more of our stories on Google. A subsurface atomic test near Yucca Flats, Nev., in March 1955. (U.S. Atomic Energy Commission via AP) (U.S. Atomic Energy ...

What You Need to Know: Russia’s recent changes to its nuclear doctrine and tests of the Oreshnik intermediate-range ballistic missile are raising concerns about a potential escalation in the Ukraine ...

Satellite imagery shows Iran restoring the heavily damaged Taleghan 2 facility and adding apparent protection against future strikes.