They started out as enemies of the Allies, then they became enemies of the Axis powers when they changed their allegiance. And when they were pretending to be friends of the Polish people under Nazi rule, they intentionally failed to show up as promised to help out with the Warsaw uprising so that the Polish uprising leaders would die and not get in the way when they instituted communism in Poland (I saw the new "Warsaw Rising Museum" this past summer). Brings to mind the phrase "with friends like these, who needs enemies?" But to set clearly set the record straight, the Russians were indeed the enemy at some point no matter which side you were on.

Tell that to the Poles, the Finns and other nations that were invaded by the Russians. Only after Germany invaded Russia, Stalin decided that they are an enemy that should be dealt with.

"greatly affected" is a bit of an understatement.