Aside from destroying diplomatic cruisers, is there a way to sabotage relations between two AI empires? If so, what is it? It's entirely possible that I'm just not seeing it, but I can't seem to think of any way to do it. Even giving missions doesn't seem to do it... the lil bastards simply will not betray their allies (other than me)... and yes, in a FFA game. Even when the reward is ridiculous (with all three resources in the range of thousands), it seems like they just will not attack them.
What's the point of a diplomacy system that you can only affect positively? And if you do manage to kill their diplomatic cruisers (which is a pain in the ass for obvious reasons)... the decay rate is so slow that it doesn't really matter anyway.
So, anyway... I really hope I'm missing something here, because if not, I'll just go back to locking teams, and that kinda sucks... because then the game is just like Entrenchment, except your enemies have awesome pacts with each other.