Distant war

[Blust]

Hi, could someone enlight me about "distant war" ? I've heard it had to do with the capital of the countries, but this doesn't make more sense in my game.

Here are 2 screenshots :

Poland and Lithuania are glad to join me if I attack the Timurids, but won't join the war against Qara Qoyulun. I don't think there's such a huge difference between both of them tbh... Did I miss something ?

 

[lststc315]

I think timur's ally also count at this point. Since grand horde will join and PLC are willing to fight horde so they will join. I have similar issue before and find at most case if one of target's ally is your ally's target，your ally are more willingly to join.