Zelensky was asked to leave the White House in February after a public exchange with Trump in the Oval Office, in which the American told the Ukrainian to show more gratitude for the United States’ help in peace talks.
Asked whether Trump would change his opinion on the war in his homeland, Usyk said: “I don’t know. Maybe he’ll understand, maybe he won’t.
“Ukrainian people are dying. It’s not just military guys, but children, women, grandmothers, grandfathers.
“For me it’s hard. It’s my country. I worry about what happens in my country.”
Usyk has been campaigning for peace in Ukraine since his his rematch with Joshua three years ago.
The war broke out in the months before that fight and Usyk is still a key part of Ukraine’s peace efforts publicly, alongside retired boxers Wladimir and Vitali Klitschko.
Usyk, the WBA (super), WBO and WBC champion, will take on Britain’s Daniel Dubois on 19 July at Wembley Stadium.
It is a rematch of the pair’s bout in August 2023, which Usyk won with a ninth-round stoppage.
He can become a two-time undisputed heavyweight champion with victory or Dubois could become the first Englishman to win all four major world titles at heavyweight.