Russia is thought to have around 2,000 tactical nuclear weapons. And that’s about all we know.

Americans haven’t thought seriously about the threat of nuclear war in a long time. Now, as climate change accelerates, the peril and promise of nuclear technology feels more fraught than ever.

Biden, like his German counterpart, is asking his country to sacrifice for the greater good of punishing Russia. Will British Prime Minister Boris Johnson do the same?

A new history of the Cuban missile crisis emphasizes how close the world came to destruction—and how severe a threat the weapons still pose.

Scholars have long relied on correspondence to peer into the minds of America’s presidents. But what if the letters were written by someone else?

Trump’s childish nuclear gambling and obsessive jingoism have combined in a strategy that could end arms control as we know it.

Fears of the nuclear threat may have subsided with the end of the Cold War, but the danger did not.

Reports of the dictator’s death may be exaggerated, but his health is undeniably brittle, and so is his regime.

But beyond this week’s false headlines, Trump’s double-dealings and war threats have given Tehran every reason to develop a bomb.

Trump continues to boast that he's brought North Korea to heel. The truth is much more dire.

The president is shaking down Tokyo and Seoul for billions more in security aid, and testing the foundations of U.S. alliances in Asia.

The Trump administration is poised to kill another useful treaty that contributes to trans-Atlantic peace.

The best time to get atomic weapons out was several years ago. The second best time is now.

Hawks are telling the president to toughen up on Chinese nukes, but their plan might spur a new global atomic arms race.

As the secret base gets "stormed," a veteran of war and conspiracy reporting reflects on the Nevada desert's dirtiest un-secrets.

A radioactive mess near the Arctic Circle suggests our next superpower arms race will be even more foolish than the last one.

His withdrawal from the INF Treaty will spur a rush to build new arsenals with no plan for how to use them.

After another two nights of Democratic debates, the 2020 field has spent little time on some of the presidency's most consequential challenges.

The predictable result of the Trump administration's incoherent foreign policy

If Trump wanted to give himself sweeping new powers, could anyone stop him?