Trump said the two leaders will meet next Friday. It remains unclear whether Ukrainian President Volodymyr Zelenskyy will be involved with the high-stakes summit.

Kyiv has repeatedly rejected any so-called "land swap" which would be against the Ukrainian Constitution. Zelensky's comments on Saturday acknowledge Trump's role in any peace deal with the summit but again reject the chances that Ukrainian land can be traded for peace.

• Zelensky defiance: Ukraine’s President Volodymyr Zelensky says his country “will not give land to the occupier” after US President Donald Trump said there could be some “swapping of territories” to end the war in Ukraine.