The war in Ukraine has altered the course of global history. These authors explore how. When Vladimir Putin's forces sought to conquer Ukraine in February 2022, they did more than threaten the survival of a vulnerable democracy. The invasion unleashed a crisis that has changed the course of world affairs. This conflict has reshaped alliances, deepened global cleavages, and caused economic disruptions that continue to reverberate around the globe. It has initiated the first great-power nuclear crisis in decades and raised fundamental questions about the sources of national power and military might in the modern age. The outcome of the conflict will profoundly influence the international balance of power, the relationship between democracies and autocracies, and the rules that govern global affairs. In War in Ukraine, Hal Brands brings together an all-star cast of analysts to assess the conflict's origins, course, and implications and to offer their appraisals of one of the most geopolitically consequential crises of the early twenty-first century. Essays cover topics including the twists and turns of the war itself, the successes and failures of US strategy, the impact of sanctions, the future of Russia and its partnership with China, and more. Contributors: Anne Applebaum, Joshua Baker, Alexander Bick, Hal Brands, Daniel Drezner, Peter Feaver, Lawrence Freedman, Francis Gavin, Brian Hart, William Inboden, Andrea Kendall-Taylor, Michael Kimmage, Michael Kofman, Stephen Kotkin, Mark Leonard, Bonny Lin, Thomas Mahnken, Dara Massicot, Michael McFaul, Robert Person, Kori Schake, and Ashley Tellis.