In international relations, defense realism is a variant of realism. Like realism, defense realism looks at states as rational players who are the primary actors in world affairs. Defense realism predicts that anarchy on the world stage causes states to become obsessed with security. This results in security dilemmas where one state's drive to increase its security can, because security is viewed as a zero-sum game, result in greater instability as its opponent(s) respond to their resulting reductions in security. Wikipedia does not have an article with this exact name. ... It has been suggested that Defensive realism be merged into this article or section. ... International relations (IR), a branch of political science, is the study of foreign affairs of and relations among states within the international system, including the roles of states, inter-governmental organizations (IGOs), non-governmental organizations (NGOs), and multinational corporations (MNCs). ... Main International Relations Theories and derivates Realism & Neorealism Idealism, Liberalism & Neoliberalism Marxism & Dependency theory Functionalism & Neofunctionalism Critical theory & Constructivism The term realism or political realism collects a wide variety of theories and modes of thought about International Relations that have in common that the motivation of states is in the... In international relations, the security dilemma refers to a common situation wherein two or more states are drawn into conflict, possibly even war, over security concerns when none of the states involved actually wanted conflict. ... Zero-sum describes a situation in which a participants gain (or loss) is exactly balanced by the losses (or gains) of the other participant(s). ...