well there is this little matter of the Nazi Soviet pact summer 1939.
After the starvation of the 1920s engineered by Stalin
Ukraine er welcomed the Nazis with open arms as liberators
Some men joined the Wehrmacht others staffed the nearby 'concentration camps' - as Jannie Van der Hoosit said about collaborating ( he did time) in amsterdam: you had to live and the Germans paid....
The Germans in their turn treated them with the utmost brutality.
Then the red army came
and a further hundreds of thousands to the Gulags for collaboration ( the whole of the tatars of Crimea, that is why they are now all Russian, geddit?)
Also - - Putin likes Stalin - good man, had some good points.
As an antidote watch The Death of Stalin - it is a British comedy and the actors all had a glorious time making it. [Sergei Khrushchev sniffed: this is not a subject to make a comedy about]