there were 5 mostly slavic nations that actually allied with Germany
the point you were making is USSR was taking on all of Europe which is a misrepresentation
no western European nations that were subjugted had troops fighting USSR
There may have been incidental use of some of those 5 nations I mentioned ,(Croatia , Slovakia,Hungary , Bulgaria and Rumania ) but I've never noticed it and quite minor countries except for Hungary .
Russians were fighting Germans NOT Europe in ww2 .
