How does this sound? It’s what I’ve come up with over the last 6 hours.
Taking the 4 tanks, 1 mech from Leningrad along with 2 strategic bombers from W.Germany and hitting the 4 Russian inf/3 arty in Smolensk.
1 Inf from Leningrad and East Poland each, arty from Baltic States and a fighter to engage the 2 Russian Tanks.
4 Inf, arty and tank from Bessarabia along with a tank and mech from Romania plus a tac bomber into Western Ukraine to attack the Russian 3 inf/3 arty.
Non combat the aircraft used in the attacks close to the front lines while pushing the one arty left in Romania forward to Bessarabia. The land units used to take Smolensk would be vulnerable to the 4 Russian arty in Moscow along with 1 arty and inf from north of Moscow. The UK would probably fly more fighters up to help defend giving the Italians some relief in the med.
Purchasing 2 mech, 1 tank for Leningrad and Romania. 1 strategic bomber, 4 inf and an arty for West Germany.