You seem to be completely unable to read any responses to your posts, as you keep repeating yourself "declare war". Everyone knows you can declare war, to which, every time, we've responded that being forced to declare war gives you a serious worldwide diplo hit, you get labeled as a warmonger, anyone who was friends with Venice and also neutral to positive with you now hates you. The game is actively punishing you for trying to defend (being forced to declare war even when you weren't the aggressor and having to suffer the diplo hit), meanwhile Venice can engage in an aggressive act with no penalty. And, I wasn't even responding to you when I mentioned the surround the city-state with civilian units thing. Someone else suggested that as a reasonable non-war defense earlier, which is inane, as having to build and maintain 18-24 units just for a peaceful defense against a single unit is anything but reasonable.