Well, in historic comparison he got substantially farther than the Wehrmacht did in 1941, and historically the biggest advance wasn't made until about September 1942, so there's still a fair chance to win, it seems. The question is whether the game cheats by giving the Russians more resources than they should have (especially here in this example, after the fall of a few important industrial centers in 1941 already), and how many forces will later be tied down with policing the area against the partisans.