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{{Cquote|The first assumption of realism is that the nation-state (usually abbreviated to ‘state’) is the principle actor in international relations. Other bodies exist, such as individuals and organisations, but their power is limited. Second, the state is a unitary actor. National interests, especially in times of war, lead the state to speak and act with one voice. Third, decision-makers are rational actors in the sense that rational decision-making leads to the pursuit of the national interest...

{{Cquote|The first assumption of realism is that the nation-state (usually abbreviated to ‘state’) is the principle actor in international relations. Other bodies exist, such as individuals and organisations, but their power is limited. Second, the state is a unitary actor. National interests, especially in times of war, lead the state to speak and act with one voice. Third, decision-makers are rational actors in the sense that rational decision-making leads to the pursuit of the national interest...

Realism is a theory that claims to explain the reality of international politics. It emphasises the constraints on politics that result from humankind's egoistic nature and the absence of a central authority above the state.<ref>[Introducing Realism in International Relations Theory by Sandrina Antunes and Isabel Camisão, February 27, 2018</ref>}}

Realism is a theory that claims to explain the reality of international politics. It emphasises the constraints on politics that result from humankind's egoistic nature and the absence of a central authority above the state.<ref>[https://www.e-ir.info/2018/02/27/introducing-realism-in-international-relations-theory/#:~:text=Realism%20is%20a%20theory%20that,central%20authority%20above%20the%20state. Introducing Realism in International Relations Theory] by Sandrina Antunes and Isabel Camisão, February 27, 2018</ref>}}