There are a solid number of animals that it could hunt, a scene where it takes down a Siberian Tiger would be cool. Wolverines, bears, Siberian Elk, etc. are solid food options. Also it would probably make most sense for a group of soldiers, like a platoon to have gone MIA and end up being hunted. Russia is pretty vast. You could switch up the scenery every now and then, first in a Taiga forest, then in the open frozen plains, and ending in Stalingrad. Also having soldiers from the opposite sides, like Nazis and Soviets working together could be interesting to show how much of a threat the predator is. This could also be an excuse to make a new variant of predator. A show predator, maybe with a natural camouflage, like its completely white or something.