With the end of the Cold War, the resurgence of the nationalist and separatist movements, especially in Eastern Europe and in the former Soviet Union, has gained prominence in the studies of international relations. On the ground of these movements is the Nation-State model, this is, the idea that the nation has the right to establish its own State, whose boundaries are supposed to be congruent with those of the national community. This idea, together with the presence of national minorities in many of the States in the international system, has been a source of continuous threats to international peace and stability, leading, in many different regions and occasions, to the so-called ethnic conflicts. In the end, such conflicts take place because, after all, the same territory is claimed by both the nationalist movements: the statist and the independentist. While the first one claims the right of territorial inviolability of States, the second one claims the right of self-determination of peoples. In this sense, the present study analyses the disintegration of Yugoslavia - through the glasses of serbian nationalist policies - that emerges as an ideal paradigm of the problems resulting from the pursuit of the superposition between the nation - as a cultural community - and the State - as a political community.