It depends on the outcome of the firswt battle. As a German player, I try to capture Vborg and Leningrad in the first turn to take away lending area for fighters from England. Fighters are better to give to the Russians since they are cheaper, and they help defend agaisnt industrial bombing. If I play as an ally, I send all the initial fighter force to Russia, both British and American. I don’t donate the bombers, as they can help in Operation Torch, and industrial bombing.