Upon looking closely at the photos, I believe my quess is correct that these are Russian Civil War monuments. The destroyed Mk.IV is elevated on what looks to be a platform (for display) and probably was the victim of German target practice or a mis-identification in heat of battle. The 2nd photo shows 2 Mk.IV's flanking a stairway, also a static display. Without an ID on the building this is all just guesswork. I still believe that the Mk.IV's are examples captured from the Whites and displayed as war trophies although it is possible (unknown to me, though) that the Reds actually used them. Still, they are monuments to the Red victory in the Civil War. -- lancer