purchased a minor ic, as japan,in alaska, on last turn. want to build an air base next turn. not sure if the base counts as one of the three units as per the limit. I would think not since you can place a base anywhere, even without an ic.
I would consider an IC in Romania with a airfield. this would allow you to crank out troops toward Caucuses and not worry about building more than transports in the black sea. with the airfield you can scrambler fighters stationed there in defense and they can be used to attack with ground against Russia.