I love the Carinoids. They are sooo hard to flip.
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If you wanna protect a minor without going to war, just surround their star with star fighters or something cheap. Only takes 8 of them. No one can get in or out that way.
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This works even better than it sounds. The minor can "jump" around your blockade to get out; nobody can get in.
Just finished a game where I had 3 yellow stars in the Sol sector, AND (finally!) got the event that boosted Sol's planet classes (woo hoo!). The Carinoids were also in the Sol sector. Even with 4 SBs with culture modules right on their doorstep, the Carinoids never flipped, and they were safe and sound behind a screen of starfighters - when every race had Dreadnoughts in the field...
10 trade routes over about 8 map squares. About 4 more sent by the Carinoids. 12-15 trade SBs (there's no cap, and those constructors needed to go SOMEWHERE). Lots of fun and cash in the Sol sector...