I'm more than aware of the history of the pact. That is very well known. What is even more well known and far more horrific are the appalling atrocities carried out by the Nazi Germans in the former Soviet Union and elsewhere in Europe. They were much, much worse. As for comparing them to the Soviet occupation of Eastern Europe that is plainly ridiculous and trying to divert the issue. The Soviets were harsh, but not total barbarians like the Nazi Germans. Let us not forget in world war two at least 20 million Soviets died alone. There were millions of others. Nowhere in Eastern Europe under Soviet occupation were people slaughtered so systematically and in such enormous numbers. The Nazi Germans murdered millions and millions and destroyed whole cities and palaces en masse. I wonder whether you have seen the photos of the destruction? Outside the Soviet Union, Warsaw was wiped off the map. Modern Warsaw is a total reconstruction. I suggest you take the time to read some of the history in depth. I recommend some very interesting books for you which might just show you how utterly disgusting the Nazi Germans were in the former Soviet Union and elsewhere. I wonder though whether you really want to know what happened. You seem to be more interested in running away from the issue. Let's stick to what really happened, as others have pointed out on this thread.
I would suggest you read: Pavlovsk: The Life of a Russian Palace by Suzanne Massie ... it gives a good account of the looting and destruction of Pavlovsk and elsewhere nearby and the enormous efforts made by the Soviets to try to restore the barbarian destruction of the area. Read about the females who risked their lives clearing mines from the parks.
Also most illuminating is : Sunlight at Midnight - St.Petersburg and the Rise of Modern Russia by W. Bruce Lincoln - the chapter entitled 'Nine Hundred Days' will give you a good understanding of what happened around Leningrad during the Nazi German occupation
To give a perspective of what Germans knew about Nazi Germany themselves : What We Knew: Terror Mass Murder and Everyday Life in Nazi Germany by Eric Johnson and Karl-Heinz Reuband
To understand the Holocaust in Germany and the areas of Europe occuppied against their will (including large sections of the Soviet Union) : The Holocaust Chronicle - Publications International Ltd, - I wonder whether you realise Soviet prisoners of war were gassed?
Further material on Nazi Germany and its horrors - National Socialist Germany - Chapter 11 of Cambridge Illustrated History of Germany
Hitler described the Soviets as ""sub-human Slavs" and was quite happy with any means to destroy them. This was the same man who wanted to wipe St.Petersburg/Leningrad off the map completely. It's very hard to imagine a greater lunatic given the extreme beauty and priceless treasures of St.Petersburg. Let's also take some time to remember the total destruction of Lidice and its people in the former Czechoslovakia. Stalin was a horror but should not be compared to Hitler. Look at him in isolation by all means but do not try and compare him. He is a different sort of monster and did not massacre millions and millions in Eastern Europe in the way Hitler did. I could go on with much further information.
In parting what we see of the Catherine Palace today at Pushkin is largely a reconstruction as the original was mostly barbarically destoyed by the Nazi Germans, the same goes for Peterhof, Pavlovsk, Gatchina and elsewhere. We should all be grateful for the enormous rescue work carried out by the peoples of the former Soviet Union and Russia. They are the ones who should be remembered along with the millions and millions of their fellow citizens who did not live to have the opportunity to live in peace as we do. Lest we forget. Remember them. The television series 'World At War' also documents the Nazi German invasion of the Soviet Union extremely well if you want to see film, much of it shot by sadistic Germans actually delighting in the destruction which they carried out. The final episode 'Remember' is particularly enlightening.