Since Russia invaded Ukraine in February 2022, Yaroslav Trofimov has spent months on end at the heart of the conflict, very often on its front lines. In this authoritative account, he traces the war’s decisive moments to show how Ukraine and its allies have turned the tide against Russia in a modern-day battle of David and Goliath. Putin had intended to conquer Ukraine with a vicious blitzkrieg, in a few short weeks. But in the face of this existential threat, the Ukrainian people fought back, turning what looked like certain defeat into a great moral victory, even as the territorial battle continues to seesaw to this day. For Trofimov, this war is deeply personal. He grew up in Kyiv and his family has lived there for generations. He tells the story of how everyday Ukrainian citizens—doctors, computer programmers, businesspeople, and schoolteachers—risked their lives and lost loved ones.