Urs Flueeler/Pool via REUTERSParticipants listen to a speech during the opening plenary session, at the Summit on peace in Ukraine, in Stansstad near Lucerne, Switzerland, Jun 15, 2024. The war in Gaza between Israel and Hamas has also diverted the world's attention from Ukraine. Ukrainian President Volodymyr Zelenskiy trumpeted the summit's attendance as a success and predicted "history being made." "Today is the day when the world begins to bring a just peace closer," he told leaders assembled around a giant rectangular table. "He's calling for surrender," Harris said, adding: "Let nothing about the end of this war be decided without Ukraine."