President Zelensky has thanked the European Union for the support it has given to Ukraine, describing heads of state and government gathered in Brussels as "real leaders".
Meanwhile, President Trump has said Ukraine's resumption of strikes on Russian oil refineries was a disgrace.
Zelensky made the comment flanked by European Commission President Ursula von der Leyen and European Council President António Costa.
The BBC's Nick Beake reports from Brussels.
