making better alliances!

[ringenrosen]

would anybody be able to help me implement something I seen in another mod a while back about alliances.
What happened was when you made an alliance with someone then the only way to break it was with a diplomat so the alliances last longer and actually mean something. The AI couldnt just attack you if you were allied with them they had to give you warning.
I have no modding experience and wouldnt know where to start lol

[Caligula Caesar]

I would, but if that is possible, I have no idea how.