WILLIAM J. BROAD

The Biden administration has called for the retirement of the B83 superweapon, but nuclear experts say its most destructive parts will live on indefinitely in...

Analysts say the legacy of military attacks highlights the urgency of finding new ways to limit the rising dangers and prevent a repeat of the...

Analysts say the legacy of military attacks highlights the urgency of finding new ways to limit the rising dangers and prevent a repeat of the...

Two scientists said the American Physical Society had erred in evaluating their plan to use drones to shoot down North Korean long-range missiles.

For two years, an array of six underwater microphones tracked the feeding noises of marine mammals newly prevalent in New York waters.

While the risk remains ambiguous, the Russian leader’s long infatuation with the toxic arms fuels worries that the deadly poisons could be deployed in Ukraine.

Hundreds of satellites and spacecraft are keeping an eye on Russia’s nuclear forces from above. So far, they haven’t seen much to worry about.

Military experts say a new generation of nuclear weapons has raised the risk that Mr. Putin might introduce less destructive atomic arms into the battlefields...