Oleksander Samus would have happily kept working as a cartoonist were it not for the Russian bomb that exploded under his house, almost killing his teenage son. “That was the breaking point,” he says. “Can you imagine how it made me feel?” Against his wife’s wishes he joined the Ukrainian infantry, first learning how to use a machine gun before becoming a sniper and serving in the battle for Bakhmut. In the trenches around that city, which finally fell to the Kremlin’s forces after a gruelling siege, his comrades discovered his skills as an artist and had him draw pictures...