You should check out Young Grasshoppers videos for global(you’ll see all the units on the Europe map at start-up)
Sometimes I find units do sort of spill over into nearby zones.In our last game we had a lot of units parked in Romania.We parked aaa guns and air units in the black sea and just announced that they’re all in Romania.Point the noses of the planes at the territory you want them to be in so there’s less chance of confusion.