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Probably because it's the biggest country in the planet, Russia made tetris (Kinda does not matter but whatever), I also believe it's because they won the nazi invasion during May I think? It was supposed to be a surpise attack but we got em. Thus GREATLY lowering the german army in WWII and leaving us allies victorius.
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I always assumed it was simply a reference to the days of the communist regime.
But Tetris is a good guess.