Sometimes another leader comes sniveling that I am settling cities too close to them. One option is to agree to "stop settling cities so close to us" or something to that effect.
How do I know whether or not settling a particular location will break my agreement? I cannot find any obvious criteria from playing the game, and there is no warning popup when I settle cities.
edit: To clarify, I'm asking about after I agree to "stop settling cities near [them]". What I want to know is where I am permitted to settle a city without breaking the agreement.