The former chief of staff explained, in the clearest terms yet, his misgivings about Trump’s behavior regarding North Korea, immigration, and Ukraine.

Covert cetacean operations have lost their luster since the Cold War.

The Ukraine crisis has revealed that the U.S. can’t shed its “big brother” image on the world stage.

Excluding Russia from the sports and art worlds over its war against Ukraine threatens Putin’s image in the way economic and political sanctions cannot.

The fight to retake the city of Kherson plays to the Ukrainians’ strengths, not the Russians’.

The ambassador to Ukraine detailed a previously unknown phone call involving President Trump, potentially adding to the Democrats’ case that he put his own interests above the nation’s.

What were once perceived to be weaknesses are turning out to be advantages.

Start-ups are redefining great-power conflict.

The U.S. president’s optimism about Ukraine creates the expectation that everything is possible—and commits him to a Ukrainian victory.

The U.S. risks provoking Russian aggression.