The Warhammer faction Russia most closely resembles is the Skaven from Warhammer Fantasy.

>culture revolves around treachery, low cunning, and exploitation to the most extreme degree possible
>military makes heavy use of meat wave attacks, not because they enjoy it like orks, but because they are intimidated and beaten into accepting it.
>near technological parity (on-paper) with the most advanced factions but their weapons kill themselves nearly as much as the enemy. This does not seem to bother them that much though
>Ruled by a secret shadow council of rat demons living in the realm of ruin (siloviki in the Moscow metropolitan area)