Again I have to agree with Jen…
The risk of an AA being used against 2 FIGs of Russia’s, while not the best thing in the world, is offset by the fact that Germany starts off with 7 aircraft, and that a captured AA gun is more likely to inflict harm to Germany than it is to inflict harm to Russia’s paltry Air Force.
Adding an AA gun to Russia is a GOOD thing, which is why so many people work their India AA to somewhere in Russia.
A Ukraine AA fires at 2 Russian FIGs. If played well by both players, it will probably fire at them again in a take-liberate-retake sequence in Ukraine. But the CAPTURED AA Gun will fire at any of those 7 German aircraft (well six after Ukraine falls the first time) for most of the game if Germany uses their Air Force against Russia. And in a few rounds that AA can also come into play against the 7 aircraft of Japan.
The Axis start as aerial powers (14 total aircraft to the Allies 12). Russia is exclusively a land power (2 FIGs). Do NOT give Russia extra AA guns if you are an aerial power!