Alright, so, it's supposed to be self-governing. Both combatants choose another player (not necessarily an extant nation, though) to do the RNG. This player must be mutually acceptable (or, at least, both players must consent to the third party doing the roll).
Likewise, players are to update the map. It would probably be most effective to have the person doing the rolls update it.
Lastly, Christos, AA borders you, so, if you are indeed attacking everything around you, he cannot do RNG for his own battle.