Ukraine won't surrender land to Russia to buy peace, President Volodymyr Zelensky warned Saturday, after Washington and Moscow agreed to hold a summit in a bid to end the war.

Presidents Vladimir Putin and Donald Trump will meet in the US state of Alaskan on August 15, to try to resolve the three-year conflict, despite warnings from Ukraine and Europe that Kyiv must be part of negotiations.

Announcing the summit on Friday, Trump said that "there'll be some swapping of territories to the betterment of both" Ukraine and Russia, without providing further details.

"Ukrainians will not give their land to the occupier," Zelensky said on social media hours later.

"Any decisions against us, any decisions without Ukraine, are also decisions against peace. They will achieve nothing," he said, adding that the war "cannot be ended without us, without Ukraine".

Zelensky also urged Ukraine's allies to take "clear steps" towards achieving a sustainable peace, during a call with Britain's Prime Minister Keir Starmer.

National security advisors from Kyiv's allies -- including the United States, EU nations and the UK -- were gathering in Britain on Saturday to align........

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