I am not sure what you are talking about. Could you please elaborate?
EDIT: Found https://en.wikipedia.org/wiki/Ukraine#Etymology_and_orthogra... now. Thanks for the correction!
EDIT: Found https://en.wikipedia.org/wiki/Ukraine#Etymology_and_orthogra... now. Thanks for the correction!
It's the difference between a descriptive name for a region and the name of a sovereign country. This is particularly relevant given the repeated attempts to conquer it and make it no longer a sovereign country.
See here for some backstory and history:
The point is that in English, adding the definite article makes it sound like a region rather than a country: "the mountains", "the veldt", "the border land".
Removing the article is appropriate for a country, unless grammatically necessary like "The United States of America", but not "The America" or "The Germany".