militarist:
Spells like: Burden of Time, Forge of the Ancients, Arcane Nexus, Astral Corruption, Gift of Nature's bounty
are considered declaration of war against everyone and make all NAPs null and void. Of course it makes you really bad if you attack someone you had NAP with and cast one of those globals later. So yes, you had a NAP, you cast Forge, you cannot consider that your NAP with him is done, if you attack him, it'll be violating NAP and you will get bad reputaion. But anyone can attack you whenever he wants. And he may say whatever he wants to cover his tracks, even saying that he is not going to attack.
It's how it works with those globals, because some [Nexus and Forge] are like putting signs "I win, try to stop me if you can". And using it with one of the most powerful nations is not helping
