As he creeps between rubble-strewn garages near the central square of Chasiv Yar, the eyes and ears of the reconnaissance commander are glued squarely to the overcast midday sky. Most of that, though, is unfolding at a distance, — around two and a half kilometers away to be precise — where Russian forces pound the residential neighborhood on the edge of the city. What bothers the commander, 41-year-old Andrii “Yankee,” more are not the sounds of explosions but of propellers; those belonging to the hundreds of drones, enemy and friendly, constantly surveying the ba...