Sherman Garnett argues that Ukraine - for reasons of size, location, diversity, historical relationships, and recent resilience - could play the role of the region's security "keystone." Tracing the country's domestic politics, steps toward economic reform, and foreign-policy decision making toward both Russia and the West, the study dispels widespread misconceptions and reveals the broad stakes in a thriving and stable Ukraine. Garnett makes the case for a more comprehensive, post-Cold War U.S. and Western approach to both Ukraine and the region - one that looks beyond recent nuclear disarmament success and NATO expansion - and suggests the main elements of such a long-term policy.