The whole of Ukraine was an administrative region. Never was a real separate anything.
In modern terms, yes. But there was a Middle Ages kingdom of the princes of Kyiv who ruled an ethnically and linguistically distinct area, that just for centuries was passed around and broken up between various other countries, in modern terms Russia, Poland, Romania, Lithuania, and Czechoslovakia. The cor region of the historic Kyivian realm was always acknowledged as distinct (even when divided among conquerers) region due to linguistic and ethnic homogeny.
Fair enough
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