Anti-Tank Dog Mine
A soviet dog mine in training, or so it would appear. What is interesting about this picture is that although the training tank does not have a real gun, its turret appears to be that of the T-34/85. The T-34/85 was not introduced until 1944 (and this version is 1945 or later, as can be ascertained from the mushroom ventilation dome at the front of the turret roof), yet dog mines were supposed to have been withdrawn after 1942! This suggests that although the Soviets did not use dog mines after World War Two, it was not a concept that they completely abandoned.