A ballad about ethnic cleansing was an unusual choice for Eurovision, a competition best known for glam, kitschy pop. But seven years ago Crimean Tatar singer Jamala swept Ukraine to their second victory in the song contest with 1944. It told the story of the deportation of her entire people – hundreds of thousands of women, children and men – from their ancestral home to central Asia on Stalin’s orders. The Tatars’ exile lasted decades, and when they were finally allowed to return, their centuries-long history had been all but erased. Russians had moved into their homes, and the peninsula’s...