When Leaders Learn and When They Don't investigates two extraordinary leaders—Mikhail Gorbachev and Kim Il Sung—by employing sophisticated methodologies and advancing a new theory of foreign policy decision making. Both leaders redefined the theory and practice of international relations and left a heritage that we face today—a unipolar world in which security threats no longer emanate from the rivalry of two superpowers but rather from the existence of rogue states such as North Korea. Akan Malici demonstrates how Gorbachev moved the antagonistic superpower relationship toward a Kantian world of friends while Kim reified a Hobbesian world of enemies at the end of the Cold War. The book carries implications about declining and newly emerging threats as the configuration of the international system changes.