This is the 395th most frequent Ukrainian word.
зеленського
The Ukrainian word "зеленського" is the genitive case of "Зеленський," meaning "of Zelenskyi" (a surname, often referring to Volodymyr Zelenskyi, the President of Ukraine).
In this sentence, 'Зеленського' is a proper noun in the genitive case, indicating possession or association.
Учора я дивився інтерв'ю із Зеленського.
Yesterday, I watched an interview with Zelensky.
Here, 'Зеленського' is in possessive genitive, referring to policies belonging to Zelensky.
Група обговорювала політику Зеленського.
The group discussed Zelensky's policy.
In this instance, 'Зеленського' is used in the genitive case to indicate possession, signifying something belonging to Zelensky.