Although there is no Soviet/Russian campaign, Russia plays a significant role in the storyline, both on the side of and against the player.
There is tension within the Russian government between the Ultranationalists and the Loyalists.
The Ultranationalists idealize the old Soviet system, as they believe the federal government to have western interests at heart, rather than the interests of the Russian people.
The Loyalists are the federal government’s forces.
Sometime before the start of the game, these tensions break out in a civil war.