Ukrainian President Volodymyr Zelenskyy will head to Washington on Monday for talks with U.S. President Donald Trump after Trump's summit with Russia's Vladimir Putin secured no agreement to end the war in Ukraine.

Zelenskyy said he held a "long and substantive" conversation with Trump on Saturday after the U.S. leader met Putin in Alaska. He thanked Trump for an invitation to meet in person in Washington on Monday and said they would "discuss all of the details regarding ending the killing and the war."

Zelenskyy reiterated the importance of involving Europe.

"It is important that Europeans are involved at every stage to ensure reliable security guarantees together with America," he said. "We also discussed positive signals from the American side regarding participation in guaranteeing Ukraine's security."

Zelenskyy said he spoke to Trump one-on-one and then in a call with other European leaders. In total the conversations lasted an hour and a half.