hmm… I’d say the north is actually more important that the south for German invasion. I usually put a miIC in Rom, so I can defend and attack from there. The advantage to the invasion into north Rus is that you get Len for the 5+ NO, protect the Nor/Den NO, and block the Rus NO in Arch without worrying about naval dominance.
The south has more cash I know, but if you can park in Bry, then you cut off the Ukraine and can take it at your leisure, not to mention take Vol.
I don’t know. I guess a multi province defense by the USSR with real amounts of units could work depending. But I would fear the German player would see it, attack only very select groupings and move right on past to bry.
Using math, tanks have a huge defensive advantage against infantry of the same IPC value, making any army tank heavy ironically have better defense.
Usually as the USSR I tend to reinforce 1 or 2 strong points, usually Len and Mur so that the Ger player has to attack me at relatively strong defense points, drawing his infantry off.
I will say a lot depends on the particulars, but just pulling back to Moscow is inviting disaster