Most theories of international relations are based on the idea that states always act in accordance with their national interest, or the interests of that particular state. State interests often include self-preservation, military security, economic prosperity, and influence over other states. Sometimes two or more states have the same national interest. For example, two states might both want to foster peace and economic trade. And states with diametrically opposing national interests might try to resolve their differences through negotiation or even war.
Realism is commonly viewed as the most dominant and oldest theory of IR, starting with the classical realism of Thucydides, Hobbes, Machiavelli and later Morgenthau to structural realism whose major advocates are Rousseau, Waltz or Mearsheimer. Realism, like any other International Relations theory, seeks to better understand the connections that bind the global community through the consideration of states and other agents. The clear core ideas of Realism have been best summarized by Dunne and Schmidt in the principles of statism, survival and self-help.
Realism is a particularly state-centric approach as the sovereign state is considered as the central actor in international politics as well as the legitimated representative of the society. A state’s primary interest is self-preservation. Therefore, the state must seek power and must always protect itself. In this context, one of the main realist arguments is the absence of an overarching central government/authority in the international sphere. Such a condition of‘Anarchy’ does not imply the presence of chaos and disorder. It simply refers to the absence of a world government (Waltz 1979, 88). With no overarching global authority that provides security and stability in international relations, world politics is not