The end of World War II also marked the simultaneous beginning of a visible division within the victorious coalition, which had begun during the war and at its end experienced full affirmation, striving for a diametrical division and the formation of mutually opposing military, political and ideological blocs. The Soviet Union sought to form its own military and political bloc in a situation where it was gradually clashing with its former allies within its zone of influence. The most important common issue was the project of creating a Balkan federation. Although conceived as a formula for resolving the political and ethnic tensions that had been present in the Balkans for a long time, the imagined federation did not get a chance to realize them in practice. The conflict between Yugoslavia and the Cominform countries led by the Soviet Union affected relations between Yugoslavia and neighboring countries, marking the end of a period of intensive cooperation and putting an end to the project of creating a Balkan federation. At the same time, the attitude towards the civil war in Greece opened the way for a future conflict by manifesting ever greater, deeper and more drastic conceptual differences between the closest allies.