[melnorjr]

Diplomacy binding means that if you agree to a Non aggression pact for x number of turns, you can't attack till those turns are up, or until a specified turn has been reached, or whatever you agree to. if you agree to an indefinite Non aggression pact with a 2 or 3 turn warning when you go to break it - give that warning before you attack.

If you agree to something vague like "We wont attack each other for a while" well then, you can break that whenever you feel like it with no warning, cause it doesn't say otherwise), and 'a while' is subjective(though if you turn around and attack immediately, your online reputation might suffer, but that's nothing to do with this game).
any pact that is not specific is interpreted as subjective and able to be broken when you feel like it.

Basically it means that if you agree to something, you are expected to follow through with it.