It is a thought provoking series for sure. What the public is not exposed to is a balancing view from those who were left at Stalin's mercy in Eastern Europe after Churchill traded us for Greece. To the victor goes the spoils!
It is one thing to be a leftist westerner and present Stalin in a favorable light and another one to hear the opinion of those unfortunate enough to live under their occupation. It was not fun at all and one cannot understand what that means from reading a book or watching a movie about it.
The main idea sewing all episodes together is nobody does anything without having a direct interest in it. Pay attention to it and it will be rather obvious. Money talks. What do all want? Power and control for as long as possible. Which one are you willing to accept at the head of the table? That is the question...