The AI doesn't use this properly. Non-intercourse treaties work wonderful. The AI, however does do a really good job of obeying them. Much better than normal. If you get one, they are very unlikely to send ships into your systems. The ones they had already sent won't be retargetted, but very few new ones come your way. And when they do show up, you can kill them. But you might provoke a war if you do.
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