I think it ran deeper than Potsdam.
The Soviets (more than just Stalin) had a deep suspicion of the West and their motives. Stalin ignored warnings from various sources of the impending Barbarossa invasion largely because he feared that it was a Western (Churchillian) plot to goad the Soviet Union into launching a war against Germany. Once German-Soviet hostilities were launched, up through late 1943 Stalin and a large part of the Soviet rank and file believed that they were largely alone in fighting the Nazis in Europe. Allied actions in North Africa were seen largely as a diversion and that Soviet calls for the Western Allies to open a second front in Western / Northwestern Europe were largely going unheeded. Put that in the mind of a paranoid megolomaniac like Stalin and the environment around him that he created, and it is easy to see how he could build the belief that the Soviet Union stood alone against the fascist Nazis. True or not (and there is room for debate), Stalin and his Communist Party used the belief that "Russia Stands Alone" as a rallying cry.
There is some validity to the argument that part of Churchill's strategy to attack the "Soft Underbelly of Europe" was to allow the Nazis and the Soviets to bleed each other white on the Eastern Front -- expending the majority of their combat power against each other -- letting the Nazis break their back against the masses of Soviet soldiers -- before the cross-channel invasion took place.
Factoring all of this together and I think you could make a case that this engendered some pretty serious resentment amongst the Soviets against the Western Allies. Soviet casualty figures in the immediate aftermath of the war ranged from 20 million to 60+ million (how much fact and how much Soviet propaganda? In 1945-46 it was no doubt largely propaganda because I believe that the Soviets largely did not know the actual number) -- collective hardship and suffering was used to bond the Soviet people together, and much of the Soviet Union was held together in common opposition to the enemy of Nazi Germany. Without a common, monolithic enemy to rally around, could Stalin hold the Soviet Union together?
Remember too, that much of the Soviet propaganda around the war was that it was a war of survival between two competing ideologies -- Soviet Communism vs. Fascist Nazism, and Soviet Communism won the day. Now, with the war over, democracy also triumphed over Nazism and Fascism -- so, which system, which ideology was superior? Perhaps the only way to decide that was to continue the war.
Just some food for thought to consider in guiding your research.