Here is my ridiculous prediction. America collapses, there are a series of civil wars, Russia expands into Europe and China Pakistan and India have a little war.. it goes nuclear and most of Asia becomes uninhabitable. Russia expands, most of its eastern territory is wracked by a mild nuclear winder and lots of people die, but its Russia so they don't care. However due to the loss of manpower from the east their Western War comes to a grinding halt. Probably somewhere mid Germany. (As much as I love Poland they can't stop Russia themselves and the other Western powers have a long history of not helping them even when its in their own best interests)
Meanwhile after a long bloody civil war America re-solidifies as something different, and a lot more brutal (I'm predicting ideological genocide... ideocide if you will, no more liberals, as it the libertarians and conservatives with the guns and they are getting sick of the way things are going in the states)So a re-solidified USA (probably called something different) climbs out of the ashes and begins to work its way back to the top.
In Europe the Russian empire will either slaughter the inhabitants of its new holdings wholesale like Stalin did, or (as few people are as evil as he was) It will have trouble holding them as the inhabitants will not stop sabotaging all their things (Especially in Poland) and they will be forced to give them more freedom and probably abandon their new holdings in eastern and central Europe (they will hold onto the Balkans). So, Russia will lose a lot of land in the West and gain some in the East and South. America will be a new power, but tend toward a isolationist policy (Probable that there will be more than one country for a while, also that it will expand into Canada and Mexico)
Anyway, that's what I see happening, ya know... maybe.
EDIT: Also, Russia may have another civil war, the line of Czars (Tzars, whatever) is still unbroken, I wouldn't be surprised if Russia split into White Russia (under the Czars) and Red Russia (under the current government)