I like to hold back all my Tanks and Fighters on the Eastern Font, say in Eastern Europe, and with a buffer of Infantry in and around them. Then, when Russia stretches out to far, I smash all his major military force in one fell swoop. Should he play smart, and keep playing defensively, I put out a force large enough to cause troubles if Russia ignores it, but small enough to be a temptation for him to destroy, and walk into my dead-zone. Just a thought…