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.

Russian forces have become adept at retooling Iranian kamikaze Shahed drones, making them more deadly and less vulnerable to Ukrainian defenses, according to Kyiv.