Operation Snow White - The river crossing and initial attack has been successful. But as the resistance stiffens, and supply lines lengthen, it could get tougher. Repairing the rail road behind the attack force will be critical to keeping the men supplied.
Maikop Sector - The defensive line along the river hasn't seen much pressure... yet. The Germans are regrouping for another major push toward Maikop, and will likely then pivot toward Grozny.
Voronezh - A gap in the Axis line could provide an excellent flash point for an offensive. But I have absolutely no available Russian troops to conduct such an operation right now. Once Finland is fallen, I can begin to explore offensive operations in the gut of Mother Russia.