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I have looked it up. That’s why I’m correcting you.
The country changed it in 1991, which is the year they got their independence.
“Ukraine” means “borderland”. Adding “the” in front of it makes it descriptive: the borderland of a larger nation. Removing the “the” makes it a name, which it is, because it’s its own country.
I don’t correct people unless I’ve already looked it up. And I don’t continue the conversation without looking it up again. Just say “Ukraine”.
Why would you disregard the political implications?