The article analyses the influence of existing and potential international organisations on development and implementation a political line of post-Soviet space countries inEurope. Statehood formation of sovereignBelarus,MoldovaandUkraineis taking place in the period of constant dynamic changes not only inside these states but also in the region (Eastern Europe), continent and the world. Globalisation and regionalisation processes affect more and more space and have an increasing impact on foreign and domestic policies of these independent states. In a rapidly globalising world leading countries make efforts to structure existent processes by establishing integration organisations that effectively meet the challenges of the changing world. The region, which includesBelarus,MoldovaandUkraine, is at complex geopolitical surrounding, and under influence of two integration organisations: expanding European Union in the West and emerging Eurasian Union in the East. In the absence of potential integration these two organisations have competitive and alternative relations. Therefore, East European states are affected by both organisations and this leads to a strategic dilemma and forces these states to choose a direction for integration.

The article illustrates the structure and dynamics of East European countries international cooperation with regard of international organisations and initiatives. It also describes genesis, practice and political prospects of post-Soviet states inEuropeand provides a forecast for diplomatic landscape in the region and its impact on global and European stability.