The rules are written the way they are. That was the designers intent.
It’s not every case that the allies are going to agree on everything. In Face to Face games, this can sometimes be the Axis edge.
Do you remember the Middle East money? in the Original Europe circa 2001? If the allies can’t decide who pays… Germany decides. :P
Power brokering, and politics is a -part- albeit small, of the game.
A move I’ve seen allowed on a few occassions, is to let the Russian cruiser out through the straight of denmark, but ONLY in the case, that the Russian Sub goes with it.
The rules stipulate the condition… and that’s why it must be explored.
Belligerent allies, are also incredibly common ONLINE. As an Axis player, another angle of your game, is getting your enemies to blame each other. :P