I can speak for Poland that people don't mind the gravesites for the brave Soviet soldiers who died) but they don't want to see a monument that talks about "the Liberation of Poland by her Soviet brothers" or communist motifs talking about how Poland was saved by the USSR.
I see you point and agree, but the Russians who died fighting to throw Germans out of Poland didn't have much choice in the matter one way or the other. They went where they were sent and a lot of them died fighting the Germans there. With the exception of some special troops, the vast majority were just State property used to achieve State goals.
Let them at least be individuals with a decent, undisturbed, resting place when they're dead.
JMHo