Not all Russian units were of the communist belief, especially the Ukranians. Many willingly when captured went to the German side and were used by the Waffen SS which provided the connection to the KZ system where many were guards and worse. Makes sense they would use familiar weapons, inventoried and issued by the Wehrmacht. How they got back to the Finns is another question.
There were also Finnish units that were part of the Waffen SS Nordland Division who possibly could have used Russian weapons.
RK
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