This is the 9th most frequent Ukrainian word.
україни
"України" means "of Ukraine" in English.
The word 'України' is used here in the genitive case to indicate possession, showing that the culture belongs to Ukraine.
Я пишаюсь культурою України.
I am proud of the culture of Ukraine.
The word 'України' in this sentence is in the genitive case to denote the object of traversal, indicating that the action occurs on the territory of Ukraine.
Ми подорожували через територію України.
We traveled through the territory of Ukraine.
The word 'України' is used in the genitive case to specify the origin or relationship of the citizens, showing they are from Ukraine.