I leave Archangel and Karelia wide open.
1. Germany can kick the crap out of Karelia anyways. It’s like throwing away a 3 IPC unit for 1 IPC. (it’s expected that there’s about 1/3 chance of the Russian infantry killing something a 3 IPC German infantry). I do not expect the Russian infantry to survive more than one round of combat, because of the overwhelming force Germany can bring to Karelia.
2. Since Germany can take Karelia if it wants it, I will leave Karelia open. If Germany DOES take Karelia in force, well, that’s that anyways. If Germany blitzes Karelia, I just re-blitz from West Russia. Free IPCs.
3. Leaving a unit in Archangel is no point. Only German unit that can take is a tank. I will happily kill that German tank on R2. Germany traded 5 IPC of MOBILIZED units for 2 IPC in the bank and 1.5 IPC of mobilized Russian IPC (infantry).
Therefore, I leave Archangel and Karelia open. Germany can do whatever. Russia has strong counters to any German play.
This is after West Russia/Belorussia, plus no fighter buy or Russia.