Not to be a whiner, but what can a human player, in a deity/immortal game, realistically do in the first 80-ish turns to challenge Mongolia on the far side of the map in a way to prevent them annexing 3-5 city states in that time?
Declaring war? Tried it several times, doesn't deter them from annexing their neighbouring CS, they simply won't send troops towards you for a long time. Bribe another civ to go to war? In the (gold-)sparse start of the game, it's either impossible or you'll have to "sell the farm" to do it, crippling yourself. Declare war and send your troops to engage their troops? Suicide, the other AI will pounce on your defenseless lands.
What course of action am I missing/misusing?