How did the Soviet Union end?

The collapse of the Soviet Union made the bipolar world disappear, a world which through the last decades had decided about the political destiny of countries. This situation eased the reliance on culture to determine different layers of foreign policies in a government-nation level by the international players. On the other hand, it confirmed that along with the cultural role of politicians, we shouldn't forget that not seeing the effects of religious features, believes and traditions of nations on structuring a culture would cause disasters.