This is the 1151st most frequent Russian word.
украиной
"Украиной" is the instrumental case of "Украина," meaning "Ukraine" in English.
The word 'Украиной' is in its instrumental case, indicating the object with which an action is associated.
Она восхищается Украиной за её культуру.
She admires Ukraine for its culture.
Here 'Украиной' is in its instrumental case but used in a spatial context to indicate location.
Мы отправились за Украиной, чтобы увидеть закат.
We went beyond Ukraine to watch the sunset.
In this sentence 'Украиной' aligns with the preposition 'об', placing Ukraine as the object concerning which opinions or thoughts are shared.