I've been playing a solo game to test out how a game focusing on propping up Ukraine works. "It's alive... it's alive."
It's expensive, so you have to plan for it. You especially have to ration EPs, although you need to watch your FP to a lesser degree as well.
The Germans invested three cards in it: a large, a medium, and a small. The large one for the creation, a medium Increased Forced Labor to get 3 more EPs, and Anti-Bolshevik Crusade to get 2 more PP. The last one isn't absolutely necessary, but I think it's needed to take full advantage of what the Ukrainians offer on the Axis side.
Romanians demobilized an air unit for EPs. German and Romania ships are standing by to demobilize if necessary; the MS's give a hefty 2 EP each. The German panzers in this game have been lucky to have few losses, but you will be strapped for EPs so may need to scrap ships.
Make sure you take Kiev before the Autumn season. You get the initial 2 PP at creation, but you want to make sure you get those extra PPs for Autumn pay day.
And take Odessa early. Again, before Autumn season start. The Germans in this game were fortunate to take Odessa on their first attack. It's an extra PP that keeps accruing to you every season.
Before winter, try to take Kharkov and Stalino as well. More PP cities = more PP for Ukraine.
The Ukraine forcepool is rather flexible:
You can mass produce cheap 2nd line defensive units as they have eight 2-4-3s.
Their two 6-4-5 mech corps are rather cheap, just 2 RP compared to the 3 RP for the Romanian one.
Lots of division units to give the Axis an extra attacker. The armor and motorized are probably best built up to mech corps, but you also have 4 cavalry 2-4's that can add extra oomph to an attack or supplement a defense (or build up to the big 7-4 cavalry corps).
Infantry have the flexibility to build up to a 6-3 or 8-6-3. Want defense? It's only 3 PP as the 6-3 uses a 2nd line infantry. Want attack? Use the full 4 PP to get that 8-6-3.
Questions and notes:
Their big armies are incorrect in the module as 6-8-3's instead of 8-6-3's.
The rules version I have doesn't clarify what their army/political status is. Do they have a Non-Intervention Home Army like the Baltic States, Limited Active with Expeditionary Home Army, or Fully Active?