That tactic can work, but if the soviet player knows what he is doing and the dices are rolling at least averagely for him. He should win that contest.
First retreat all to belorussia, but the frontier infranty 1 on each to stop bliz and prevent him from stacking his army + planes on same location. You should buy on your 1-2 turns 1-2 tanks, 1arty and inf to gather offence power. On the 3rd turn only infranty. When the german player moves to baltic states/east poland. You hit him with everything you got. You should atleast have in this attack already 4 fighters and 2-3 bombers (British air force and usa air force) + if you bought in those first 2 turns 4 tanks you had 9 tanks atleast and some artillery + hell of a lot of infranty.
But you must attack the german stack, the germans attack is so much more powerful than they defend and that is your salvation, you don’t have to win the baltic/east poland territory back, just kill at least all of his inf and artillery away + some tanks, then retreat back to belorussia.
If things go as they usually should you should at least have destroyed his tank fodder away (inf/art). From moscow or where you bought the new reserve infranty should move down to reinforce your belorussia stack. And with 4 fighters your defence isn’t bad at all after the attack.
Hit and run tactics for russia will make it really hard for german to conquer it. But as usually if people play with these only 1 huge stack of troops and move forward style, it comes to those 1-2 great battles where the amount of dice rolled comes to decide. If one rolls very badly below average hits and one makes on that turn very lucky roll, it decides the game :)
My opinion if you really look at the game, russia is very powerful. Gaining 30 ipc a turn, because of oil money + gaining new airplanes from allied troops, russia has usually the amount it can take hits 2x or more than germans and that means it can take more hits + it has the advantage of being able to attack first to make use of it’s offensive equipment tanks + planes.
Back to this strategy, it comes down to those 1-2 big battles and the rolling of dices, but playing wisely with russia, they usually has the advantage on that. I at least haven’t got much luck with this strategy. It’s better to try 2 or 3* front assault one being from finland (norway + fin troops + additional troops with that one transport). I usually if the dices favor little me, win with these tactic divide and conquer tactic. :)