This is the 12082nd most frequent German word.
ukrainischer
"Ukrainischer" means "Ukrainian" (adjective) in English.
The word 'ukrainische' is used here to describe the flag's origin or association, modifying the noun 'Flagge'.
Er trägt eine ukrainische Flagge.
He is carrying a Ukrainian flag.
In this sentence, 'ukrainischen' is an adjective describing the person's nationality or origin, modifying the noun 'Freund'.
Ich habe einen ukrainischen Freund.
I have a Ukrainian friend.
Here, 'ukrainisches' as an adjective describes the origin or cultural background of the dish, modifying the noun 'Gericht'.