Russia possesses the world’s largest nuclear arsenal (5,580 warheads) and has repeatedly threatened escalation over the Ukraine war. -While the probability of use remains low, four main delivery systems are likely candidates for a “limited” tactical nuclear strike.

German publication Der Spiegel said leaked documents show the modernization of Russian nuclear infrastructure.

The looming expiration of the New START Treaty, the only remaining bilateral nuclear arms control agreement between the United States and Russia, has focused national security experts on what comes next.

Deadlier weapons, more nations, autocrats in charge, disinformation and collapsing arms control — the risk of nuclear catastrophe is back.

Ukraine's Operation Spiderweb took out more than a third of Russia's strategic cruise missile carriers, Kyiv officials said.

Some 150 droves are transported by truck to inside Russia, where swarms of drones arose from them and went on the attack.

Russian military analysts are hunting for scapegoats after Ukraine stunned Moscow with weekend drone attacks that destroyed a number of strategic bomber planes, weakening a key component of Russia's nuclear arsenal.

Kyiv’s attack on the country’s bomber fleet appeared designed to show Russia’s leader that continuing the war carries big risks for Moscow.

Restoring America’s leadership in nuclear power is once again a national security imperative, critical to competing with China and Russia and powering the age of artificial intelligence. The riven atom,