European Parliament President Roberta Metsola has introduced Ukrainian President Voloydymyr Zelensky ahead of his address.

"We have your back," Metsola told Zelensky. "Freedom will prevail."

Zelensky received a standing ovation as he walked into the chamber of the European Parliament in Brussels on Thursday.

"Ukraine is Europe and your nation's future is in the European Union," said Metsola at the beginning of an EU summit, as she stood next to Zelensky.

"We will be with you for as long as it takes," she said.