In Collisions, Michael Kimmage, a historian and former State Department official who focused on the Russia-Ukraine conflict, offers a wide-angle, historically informed account of the origins of the current Russia-Ukraine war. Tracing the development of Ukraine and Russia's fractious relationship back to the end of the Cold War, Kimmage takes readers through the central events that led to Vladimir Putin seizing a large portion of Ukraine--the Crimea--in 2014 and, eight years later, initiating arguably the most intensive military conflict of the entire post-World War II era. Kimmage also captures how the current war has amounted to a new age of global instability, transforming multiple great powers and dramatically altering the path of globalization itself.