Alpha Centauri
The Russians and Chinese colonized the planets and moons of Alpha Centauri B. Between the two polities, they basically control the entire system. Only a handful of colonies are from nations not affiliated with those two powerhouses, and none of them have official ties with the Western Alliance. Unofficial ties are a completely different matter of course. Even Russian and Chinese colonists love Alliance trade goods after all, especially the proscribed stuff.
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