This is the 75th most frequent Vietnamese word.
ukraine
In Vietnamese, "Ukraine" refers to the Eastern European country of Ukraine.
In this sentence, 'Ukraine' is a proper noun used as the name of the country, denoting a geographical location visited.
Tôi đã đến Ukraine vào mùa hè năm ngoái.
I visited Ukraine last summer.
Here, 'Ukraine' is used as an adjectival descriptor in the phrase 'Người dân Ukraine', indicating nationality or association with the country.
Người dân Ukraine rất thân thiện và hiếu khách.
The people of Ukraine are very friendly and hospitable.
In this example, 'Ukraine' specifies the location where the event, the war, is taking place.