Dirty Bombs and Radiological Weapons

U.S. Wires Ukraine With Radiation Sensors to Detect Nuclear Blasts

The federal National Nuclear Security Administration is setting up an advanced network that can verify an attacker’s identity.

Fears of Russian Nuclear Weapons Use Have Diminished, but Could Re-emerge

Nearly a year into the war in Ukraine, U.S. policymakers and intelligence analysts have more confidence that they understand at least some of President Vladimir V. Putin’s red lines.

Russia’s Nuclear Weapons Rhetoric: How Concerned Should We Be?

U.S. officials say they do not believe that Russia has decided to detonate a tactical device, but concerns are rising.

Russia Rejoins Grain Deal, but Warns It Could Pull Out Again

The agreement allows Ukraine, a major food producer, to export grain by sea, easing the threat of famine in other countries.

Biden Faces New Challenges With Coalition on Ukraine Support

The domestic and international consensus has shown signs of fraying as midterm elections loom in the United States and Europeans face the prospect of a cold winter.