Firstly we can look at the assumptions by realists. Ultimately in realism, international politics is a struggle for power in which every state has one main primary intention; the acquisition of power, through force via war, which to realists, most importantly is an effective mean of exerting power. As Morgenthau famously said “All history shows that nations active in international politics are continuously preparing for, actively involved in, or recovering from organized violence on the form of war”.3 Thus the international system is anarchical; consequently a state must require a military capacity for basic survival in international relations. States are also seen as the key rational actors in international relations. The final assumption is that realists visualize a hierarchy of issues in global affairs, with ‘high politics’ such as military is above ‘low politics’ issues such as the economy or social matters.
In essence, states will always act in their