In some of Evgeny Mezhevoy's darkest moments, like when he was interrogated and crammed into an overcrowded detention centre in Russian-occupied Donetsk, the single father imagined himself speaking to his three children, who he says were torn away from him at a checkpoint while trying to escape the Russian assault on Mariupol. "I talked to each one of them. I calmed them down," Mezhevoy told CBC News in an interview from their two-bedroom apartment in Riga, Latvia, at the end of November. "I said I would come for them — and I'm still alive." Those inner conversations helped sustain him...