US President Donald Trump is "extremely frustrated" with Russia and Ukraine, his spokeswoman said on Thursday, as Kyiv said Washington was still pushing it to make major territorial concessions as part of its plan to end the nearly four-year war.

"The president is extremely frustrated with both sides of this war," Karoline Leavitt told reporters. "He doesn't want any more talk. He wants action. He wants this war to come to an end."

Earlier Ukrainian President Volodymyr Zelensky made remarks that appeared to show little had changed in Washington's core position on how the conflict should end since it sent a 28-point plan to Kyiv and Moscow last month that heavily favoured Russia.

Zelensky said that Washington was still pushing it to cede land to Russia as part of an agreement to end the

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