Drones are “ubiquitous, because they are quite useful, and they're demonstrating that every day in Ukraine,” one analyst told NBC News.

Ukraine’s drone attack against Russian airfields was audacious and daring. But most of all, it was meticulously planned and flawlessly executed.

A Russian drone attack damaged apartment buildings in Ukraine's second-largest city of Kharkiv, injuring 17 people, while killing five in the northern town of Pryluky, regional governors said early on Thursday.