Kinda weird that Zhodule is basically an enclave within your territory, but if that's what you guys are agreeing to... Generally city-states aren't literally just one city, but a city that is powerful enough to exert its influence far from it. Venice was a city-state, but it wasn't inside anyone's territory. It held its own territory stretching from Venice to Greece. A city-state inside someone else's territory is arguably not a city-state at all, but like.. some sort of autonomous district or something.