Cheap, low-tech drones have become a vital weapon in a war where one side lacks long-range munitions.

Images from this year’s Ivan Kupala Night celebrations from Ukraine, Russia, Lithuania, and Poland

A lack of defense production has created an alarming gap between America’s strategy and its capabilities.

Ukrainian resistance and American support prevented a wide range of horrors.

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.

The congressional opposition to the president’s funding request explained—as far as it can be

Russia’s gambit to deter support for Ukraine by restricting energy supplies flopped—thanks to concerted action by European countries.

If world leaders had been clearer about the sanctions Putin would face, they might have deterred his invasion of Ukraine.