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I did say that the example wasn't entirely accurate. It was just an example of how changes occur in language. You can also argue about your letter "a." The country is called Belarus, so does that mean the nationality can no longer be Belarusian? It sounds practically identical. And your joke about the nationality's name in English is superficial. I didn't say that it's correct to write "Belarusian" in English; I said: "...in Albion...".
Similarly: in English, England - Englishmen, in Russian, England - Englishmen.