*A Telegraph Book of the Year* *Shortlisted for the Parliamentary Book Awards*An astonishing investigation into the start of the Russo-Ukrainian war – from the corridors of the Kremlin to the trenches of Mariupol.The Russo-Ukrainian War is the most serious geopolitical crisis since the Second World War – and yet at the heart of the conflict is a mystery. Vladimir Putin apparently lurched from a calculating, subtle master of opportunity to a reckless gambler, putting his regim