In the new film by the Ukrainian director Oleh Sentsov, soldiers pinned down in a trench try to organise the evacuation of a group of fellow fighters who are stuck and wounded in a frontline position.
Sentsov, who spent several years as a political prisoner in Russia and is now fighting in the Ukrainian army, found the 90 minutes of shaky footage six months after the battle. He was going through old files on his GoPro camera and realised it had been switched on that day.
