I am not a mod (which are players like you and me) but if your post was flagged it was for sure by regular forum members due to the mentioned cooperation of Germany & the USSR.
Everything suited to question USSR actions are not welcomed in this forum.
Regarding the rest of your post:
Not bad, but imho too much conclusions based on assumptions.
Fully aware that this getting flagged, therefore short & sweet:
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Imho you focus way too much on the MR pact. Of course the USSR had imperialistic intention to spread their ideology (as proven within the cold war). If a neutral person reads your overall post it looks like that the MR pact (and therefore the Germans) enabled them to focus on Finland or the Baltic states. I found not a single source confirming this view; maybe you can share them with us.
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Regarding claims that Poland was responsible for getting invaded: Imho the Polish government is not that innocent as it is described in biased history writing for getting attacked. If they had granted the access to Danzig, they could have avoided the hostilities. Most of the guys are not aware that Poland was a kind of pariah from the mid 1920s to the mid/end 1930s - and it was ruled by a military dictatorship. Their behavior in general (several wars with neighbours) and their treatment of minorities within their artificially created borders was a factor almost erased from the history.
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From a very holistic pov i agree that WW 2 was inevitable - but imho not only based on the Versailles treaty (borders, territory loss, reparations), it was also a fight regarding supremacy on the continent - like in several hundred years before.
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If you see the efforts of the UK and the US to create a global war - fighting the Germans was logical. I do not agree that a clash with the USSR was based on this “Lebensraum” or " Generalplan Ost" nonsense as shown in a previous post - it was simply a economic need as without oil, there is no economy. So with the RN blockade there were no oil imports from outside Europe possible. If you see famous US or UK historians like Citino, House or Roberts spreading myths based on German sources (Guderian etc.) based on ideology “Lebensraum” it is rather disappointing as they do usually neglect the fact that modern warfare was impossible without access to oil.
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You see the same effects on Japan with the US oil embargo in 1940.
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From a pure political and economic perspective the US and the USSR managed to take out the former superpower UK (bankrupt after WW 2) and prevented the Germans to become one. At least in theory the USSR and Germany are natural allies as their economies combined could have dominated the world in the last century. That’s why US foreign policy was always eager to avoid any possible alliances of those two countries.
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That 2 dictators like Hitler and Stalin fought a war was imho mainly ideologically motivated. And placing 150+ divisions near the borders to Germany based on fear of a German invasion is rather nonsense - the main reason of the early success of the Wehrmacht was a total lack of fortified defensive positions. The USSR general staff was fully aware of that the USSR is “unbeatable” just based on the vast distances and superior man power (including reservists) - the limitation of the Weimar republic to have just a 100k men army prevented to build up a pool of reservists. So this defensive claim is like the “total surprise” claim debunked since decades.