Trying to remember, Russian tank not the German one. They should be on the sides closer to the turret as opposed to the Tiger that has them on the rear, look more like someone took a large barrel and strapped it to the tank. Just look it over in binocular view and look for something red and you should be good to go.
Think it's the IS-2 Model tank, going from memory while I'm here at work

Big barrel things in the back are the gas tanks.
“Give me a woman who loves beer and I will conquer the world." – Kaiser Wilhelm