They are, actually. The media materials for the Rogue Isles back when CoV launched said that the Rogue Isles are a UN protectorate. That doesn't make them a voting country, but it does mean that UN troops have a presence, either de facto with boots on the ground, or de jure, with legal rulings declaring it so. They purportedly set them up where there's a significant risk of war without "the international community" sticking its nose in the middle. Right now according to wikipedia the UN controls either physically or legally, three of them. As an illustration of where they do that, the three are Cyprus, the Golan Heights, and Kosovo.