It is specifically mentioned in the manual that breaking a treaty will have a harsh diplomatic penalty. I am still confused as to whether the penalty is applied for all cases of breaking the treaty or only some of the following cases:
1. You have mutual treaties.
2. You are GIVING a treaty to them.
3. You are TAKING a treaty from them.
Also, how much of a diplo penalty are we talking about?
EDIT: I play TA 2.03