Ukraine’s military commander in charge of the country’s drone warfare program urged the US and NATO countries alike on Wednesday to learn from Kyiv’s use of the technology on the battlefield so in the future there are not “hard questions from your children [about] when [their] father will come back.

When the war in Ukraine erupted, the world looked to Russia’s military—long regarded as a modern, invigorated force—to act with speed and vigor. Instead, it staggered. A series of expensive blunders quickly destroyed that reputation,