After failing to hit, I was stuck in Serbia for 2 turns, my first live game.
Seeing as time is so vital, and units sent to Serbia are now 3 turns from Moscow, I much prefer (in Russia first strategies to hit lightly from Trieste). This gives you 18 infantry and 4 artillery to smack the 6 units in Romania (you should hit 4 times with 3’s, 4 times with 2’s, assuring you won’t be stuck)
Now lets assume Romania hits 3 times, (you gain 3 IPCs instead of the 2 Serbia represents by the way) this leaves you with 15 inf, 4 art that can (and likely won’t) be hit by Russia’s 9 inf and 4 art and denies Russia 3 dollars (although they save 1 inf that would be lost to a counterattack if they activated).
I use Bohemia and Vienna to hold Galicia (18inf, 4 art) and I hit Venice to prevent Italy from collecting that money and attacking into Austria.
On turn 2, you have 18+15=33 inf, 4+4=8 artillery, plus 4 fighters if built (for speed,supremacy, and casualties) that can hit Ukraine, if Russia stacked all in, in Poland, sacrifice German units to make it contested, then move in force into Ukraine (with 41 land units and 4 air units) next to Moscow for a round 3 assault.
If Russia stacks hard in Ukraine turn 1, then Silesia Germans will move into Galicia to help hold, If they attack it, Romania can fall on it.
Assuming an all in stack in Poland, you are able to stack 45 units on Moscow turn 3, it becomes contested, dropping Russia income by 6 for Moscow, 3 for Ukraine, and 3 for Poland (contested by Germany) a total of minus 12, giving them 13 IPCs to stay alive (using your first turns production in both Austria and Germany, your remaining productions can head West to stablize the French/Italian front. Germany having built 2 transport/battleship turn 1 to enable a turn 3 assault on Finland and Karalia dropping Russia to 9 IPCs turn 4 with their production locked in Moscow for the rest of the game.)
At this point, a trickle of units can keep Moscow immobolized while you turn towards France for the win.
If they don’t stack all in, in Poland, you can instead contest Ukraine with Austria, permitting Germany to Move into Poland, then Belarus. Giving Russia a hard time.