From the beginning there is no way that this conflict can be settled. The huge divergences between the two poles of the world resulted the political tension, while the skeptical attitude of the Kremlin made this situation even worse. The paranoid nature of Stalin is revealed even before the World War 2 ended; for instance, he was furious at the delay of D-Day, suspecting that it was an Western conspiracy aiming to drain the last drop of Russian blood. The two sides’ differences originated from their ideology, Communist ideology is an aggressive one with the international revolution idea wanting to expand communism. Also, starting from the late 1980s, new Soviet archived sources that were not accessible previously became available to US historians.