Tips and Tricks
Pay attention to roads and railways - they can offer sizeable movement bonuses.
Don't be afraid to use the 'Undo' button to check if you're overmatched in a prospective fight.
As the Russians, you don't have to win every fight - just delay and tie the opposition up as time ticks away and reinforcements arrive.
Use cavalry to cut off Axis forces, rendering them vulnerable.
Don't overextend yourself as the Axis - keep a line to your supplies.