It has been a long time since I played AI war and a lot has changed. I am having a problem securing some planets from attack. I have a few worlds bordering a group of worthless worlds I do not want to take. On these border AI worlds I have destroyed the warp gates, AI Eyes, and some special forces guard posts. I also have other planets elsewhere that do border AI worlds with working warp gates.
These out of the way planets I want to be safe keep getting attacked and I do not know why. They can be safe for a while, but recently after a few hours a group of like 250 mark IV ships just 'appeared' (I am not exactly sure, I just noticed the warning that a command station was about to go down) in one of these supposedly safe worlds and began tearing things up.
Someone suggested the border aggression mechanic, but the border worlds had at most, 650 ships on them. These border worlds are isolated in a pocket. There are 4 AI worlds who have no connection to any other AI world other than these 4.
Why do I keep being attacked over and over? How can I make these worlds truly safe without actually packing them with defenses. The whole point for me is to remove the need to spend a bunch of my turrets protecting a border, yet now I can't seem to manage it.