"Vladimir Putin is the world's most dangerous man. Alone among world leaders, he has the power to reduce the United States and Europe to ashes in a nuclear firestorm and has threatened to do so. He invades his neighbors, most recently Ukraine, meddles in western elections, and orders assassinations inside and outside Russia. His regime is autocratic and deeply corrupt. But that is only half the story. Unflinching, hard-hitting, and objective, Philip...