Leningrad: Not one step back!
This strategy assumes a German DOW2, but is well suited for earlier or later declarations of war.
Russia 1
Purchase: 3 Artillery, 6 Mechanized Infantry
Non-Combat moves
3 Infantry from Vyborg move to Karelia
6 Infantry, 1 Artillery move from Novgorod to Karelia
3 Infantry from Baltic States move to Novgorod
1 Infantry from Belarus moves to Novgorod
1 Infantry from Archangel move to Novgorod
1 Tank, 1 Mech. Infantry from Russia move to Belarus
1 Infantry, 1 Artillery from Russia move to Smolensk
2 Infantry from Eastern Poland move to Belarus
2 Infantry from Bessarabia move to Western Ukraine
3 Infantry from Ukraine move to Western Ukraine
1 Mech. Infantry from Volgograd move to Bryansk
All Siberian infantry unite at Buryatia
Building Phase: 3 Mech. Infantry in Volgograd (for Iraq), 3 Artillery in Novgorod and 3 Mech. Infantry in Russia
Collect income: 38
The heavy reinforcement of Karelia is done in order to let Germany use the 7 Scandinavion infantry move defensive, ideally to keep them in Finland. This results into 7 less infantry that can attack Novgorod in G3. The strategy is based around taking over Scandinavia from Germany, while being able to respond quickly to opportunities or the ultimate defense of Moscow. In order to conquer Scandinavia two things need to be achieved: Leningrad must hold its ground and the Baltic fleet needs to be destroyed. This can all be done by luring Germany to the southern route to the oil.
Russia 2
Purchase: 3 Artillery, 6 Mech. Infantry
In case Germany has kept its infantry in Finland while moved its main stack to the Baltic States, retreat Karelia into Novgorod, together with the reinforcements from Belarus/Bryansk. You now have 2 AA, 18 Infantry, 2 Mech. Infantry, 7 Artillery, 1 Tank, 1 Tactical Bomber, 2 Fighters defending Leningrad, against 16 Infantry, 3 Artillery, some Eastern tanks and Luftwaffe that was in place. This Leningrad can be reinforced by UK / French fighters that landed in Scotland UK1.
Keep buying Mech. Infantry and Artillery. There are several tactical possibilities Russia gets when its Infantry mass gets mechanized. From Russia it can reach Ukraine in a single turn. Massed Mech. Infantry in Novgorod can combo-attack a big German stack in Bryank together with Russia, strafing and retreating back into Moscow. It can put out an incredible counter-attack when mixed with well placed groups of Artillery. While I agree Russia needs to bulk up as much as possible, I think building mainly infantry limits Russia in its option to counter-attack. As soon Germany makes one mistake, Russia should be able to fully capitalize this. Also building infantry can not defend Leningrad, Moscow and Stalingrad, while mech. infantry will be much better suited to relocate to strongpoints. Finally, mech. infantry can help out China faster later in the game when breathing space is created with Germany.
In R2 you liberate NW Persia with 1 Tank, 3 Mech. Infantry, 2 Infantry and attack Iraq the following turn. As soon Iraq is captured, 1 Tank and 1 Mech. Infantry go for the money hunt Italian countries such as Somaliland and Sicily/Sardinia.
In the meantime, USA buys the first three rounds Bombers, that are sent as soon as possible to London to take out the Baltic Fleet. As soon as the Baltic Fleet is destroyed, the Leningrad forces will start to advance. Even if Leningrad has fallen and Russia is unable to conquer Scandinavia, the UK can take Norway. The UK will build up its invasion fleet as soon is clear Germany will go for Russia, in the meantime it builds fighters / land troops. This will allow the UK to start doing amphibious attacks UK3/4 in Western Europe forcing Germany to spend forces to the Western front.
Combined UK and USA efforts will contain Italy without too much effort. The only way this can be prevented is heavy airlifting from Germany. This is good for Russia as it diverts German power away from Russia.
While going the southern route will provide a lot of money for Germany, its infantry needs a lot more time, 2 more turns, to get there instead of Leningrad. These 2 turns will provide to be crucial for Germany to become more divided, lose some of its Luftwaffe while its supply lines will be stretched deep into Russian territory. That time allows Russian to build up a counter-attack consisting of lots of Mech. Infantry and Artillery.