Works both ways. It could also encourage huge blocks forming, with no one daring to attack anyone else, because everyone is paranoid that ten third parties will randomly take sides and every little war cascades into a chaotic mess.
So nobody does anything because they don't know what'll happen if they actually declare war.
I've had some bad experienced with Victoria II MP...
We don't have the problem in EU4 campaigns
Yeah, sometimes you die because your ennemy suddenly receives ton of help, but it is generally your fault because you didn't do enough diplomacy.
I talk from experience
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