War in Ukraine: The Ukrainian teacher who teaches history to his invaders

In a colourful café in the peaceful town of Bila Tserkva in central Ukraine, a 59-year-old history teacher settles down, opens his laptop and connects to Chatroulette, an online platform that connects strangers from around the world.

Ukraine uses drones to fight the Russian army. These particular soldiers are positioned at a distance from the front, with their eyes riveted behind screens.