The leaders are holding a meeting as part of Zelensky's first official visit to Brussels, according to an Ukrinform correspondent.
Journalists could attend only a handshaking ceremony.
President Zelensky arrived on his first foreign visit to Brussels on June 4.
He plans to meet with NATO Secretary General Jens Stoltenberg, European Commission President Jean-Claude Juncker, European Council President Donald Tusk, European Commissioner Vice-President for the Euro and Social Dialogue Valdis Dombrovskis, and Polish President Andrzej Duda.
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