This is the 1037th most frequent Polish word.
ukraińców
"Ukraińców" means "Ukrainians" (genitive plural form in Polish).
In this sentence, 'ukraińców' refers to individuals of Ukrainian nationality.
Dwóch ukraińców wyjechało dziś na wakacje.
Two Ukrainians went on vacation today.
Here, 'ukraińców' denotes a group of people, emphasizing possession through context.
Historie ukraińców są często inspirujące.
The stories of Ukrainians are often inspiring.
'ukraińców' in this case specifies a collective group of Ukrainian individuals.