AI not considering powerful allies before surrendering to vassal demands

[Mods]

This is pretty frustrating
You spent a ton of trouble putting a family member on throne X. When duke of nowhere presents his ultimatum King of X surrenders without a fight, completely neglecting his extremely powerful allies who'd help him crush the revolt without any problems. :glare:
Anyone else came across to this?

 

[Mutineer]

Actially it does, but it does not compare your potential power, but actual power at that monent in form of active armies.

 

[Mods]

Actially it does, but it does not compare your potential power, but actual power at that monent in form of active armies.

You mean it'll only ask for help when you're already involved in a war (and thus have your levies raised) and won't when you're in peace?

 

[Zireael]

I think the ultimatum mentioned was a faction ultimatum. Which takes only the liege's power into account. Not his allies, not the fact that some armies might be raised...