I stack Galicia AH1 with almost everything I can muster, something like 34inf and 10 art (I attack Serbia with 8 inf/2art but leave Rumania alone). This means Russia unless sucidal will empty Ukraine and Polen R1, stack Belarus with 27inf/10art.
I would still stack Ukraine as Russia. The Austrian count that can attack is 34 inf, 8 art, 1 fig. That’s 43 units, with 18 1/3 hits on average. As Russia I’d send 1 inf from Sevastopol to activate Romania (pays for itself, and you have to kill them or defend Budapest) The remaining Russians will go to Ukraine, creating a super stack of 29 inf, 11 art, for 40 units with 20 hits on average. Russia would buy 3 inf, 1 art, 2 fig to be able to counter a Ukraine attack with air supremacy. They’d also have the Romanians, the Livonians, the Karelian, and the buy to counter with.
If Austria makes the attack and gets 19 hits to the Russia’s 20, they’ll have 14 inf, 8 art, 1 fig left and Russia will have 10 inf, 11 art left. Russia will then attack the remaining Austrians with 24 inf, 15 art, 2 fig. Not going to be pretty for Austria.
So since you won’t be able to prevent Russia from stacking Ukraine once, you might as well smash both Serbia and Romania, take the extra money and force them out Round 2 when you have the Serbian task force, the Tyrolians, and a full ground Round 1 buy.