On patrol on a ruined street in a ruined city in a ruined corner of eastern Ukraine, a sprawling war is condensed to a few hundred yards in every direction, including into the sky.

¡°Drone,¡± Oleg, 23, a soldier in the 79th Air Assault Brigade, said as the whirring of what sounded like a lawn mower grew closer.

¡°We keep going,¡± he said. Russian attack drones were one more danger in a life full of them. ¡°You have seen our location ¡ª it is always under fire,¡± Oleg said. ¡°It is very difficult to hold these lines.¡±