Freeing subject slaves

[Marker753]

I made a hive mind my vassal but after the war I was looking at their planets I found one was using a bunch of races including mine as livestock. They should add the ability to manually change the policies of subject nations so I could force them to release the slaves as refugees

I could wait to integrate them, keep the livestock planet and release the other hive planets again. They should add the ability to manually change the policies of subject nations but I’ll have to wait another 10 years. I might just have to exterminate the whole hive

 

[Slickbawsmcgraw]

Given that they're a vassal, have you tried to use trade deals to take the system from them? I know that most AI empires will never give away territory under any circumstances, so this probably won't work but I'd like to think that the game is consistent enough that you could seize planets from subjects easily enough.
I never use vassals, so I can't say this works but it's worth trying.

 

[Marker753]

I tried trading them resources for the system but no. I decided to just to integrate them and exterminate the hive

 

[Slickbawsmcgraw]

I tried trading them resources for the system but no. I decided to just to integrate them and exterminate the hive

That sucks, but at least you got a way round it. It annoys me that the AI are so resistant to hold onto each and every one of their systems, even if it's strategically insignificant to them. I swear the patch notes say that the AI are more receptive to system transfers, but they only seem interested in actually gaining territory, never trading even if it's a better trade for them.