After the fall of the Soviet Union, the USA seemed to be emerging from a vulnerability to dramatic destruction that it had lived with during the four decades of the Cold War. Two decades later we find ourselves in a world with nuclear weapons once again gaining a disturbing salience.The theory of deterrence for security purposes has new complexities. Ambassador Robert L. Gallucci, distinguished academic and diplomat, speaks from his multifaceted career in foreign affairs and public service, including years of leading negotiations with North Korea. He will share insight and new perspectives on this reemerging global concern.