In July 2014, soon after Ukrainian forces reclaimed the city of Sloviansk in the Donbas region from pro-Russian separatists, Russian state media ran a troubling interview. It was with a woman claiming to be a refugee from Sloviansk, named Galyna Pyshnyak. The story she told reporters was sensational — it was also false. Drawing parallels to Nazi soldiers during World War Two, Pyshnyak alleged she had witnessed Ukrainian soldiers crucify a three-year-old boy on a notice board in front of a large crowd in the town's centre. She claimed the mother of the boy was then tied to a tank...