Russian seriously injured by drone

Footage recorded by an armed Ukrainian quadcopter shows the drone engaging a one Russian infantryman. The drone drops a grenade, but the soldier is able to maneuver out of the blast radius. The soldier then decides to fire his rifle at the overhead drone, but he is unable to hit it as the device drops another munition. This time the grenade explodes right next to its target, peppering the soldier's left side with shrapnel. He tries running away but falls due to his injuries. He then crawls away to find cover.