This course will provide students with an understanding of the current matrix of nuclear non-proliferation treaties, multilateral arrangements, laws, regulations, initiatives, proposals, and organizations that aim to halt the spread of nuclear weapons and prevent nuclear terrorism. The goal is to examine the full array of tools employed by the United States to address nuclear proliferation, as well as how the Executive Branch brings these tools to bear through the inter-agency process and its joint efforts with Congress and international partners. Virtually every element of the nonproliferation toolbox was deployed to address the nuclear programs of Iran and North Korea, so considerable time will be spent examining these critical cases. We will also examine how the nuclear programs of India and Iraq shook and ultimately altered the nonproliferation regime. Throughout the course, we will consider nonproliferation efforts in the context of great power strategies, alliance obligations, and regional rivalries, on how these factors influence the decision-making of proliferating countries and countries seeking to prevent proliferation. A continuing theme in the course will be the evolution of nonproliferation tools over time and the role of and lawyers in that evolution.