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Even if the red massive Uber-thing looks like The Mother of All Britwanks, it could actually be anything else, like a Dutch superpower, an absurdely oversized US, the deadliest Indian Empire ever seen, even an overextended Inca empire (ASBish) .
Similarly, the other green Uber-thing has not necessarily to be Russia: it could be a Mongol khanate of some kind, Khazaria, or the like. The dark-green one could be Greece, rump Ottoman, or Byzantine. I'm afraid that the very much France-like thing in yellow makes all this very unlikely though, you can work it out as a very odd Tuareg empire if you want to but i think it has actually to be France.
POD has to be after 476 AD. Enjoy.