US Secretary of State Marco Rubio boasted "tremendous" progress after a day of meetings with Ukrainian and European officials in Geneva on a proposal to halt the Ukraine war, but numerous uncertainties remain.

The head of Ukraine's delegation Andriy Yermak also told reporters earlier that the sides had made "very good progress", and were "moving forward to the just and lasting peace Ukrainian people deserve".

US President Donald Trump had given Ukraine until November 27 to approve his controversial plan to end the nearly four-year conflict that erupted after Russia launched its full-scale invasion.

But Kyiv is seeking changes to a draft that accepts a range of Russia's hardline demands, with the 28-point plan requiring the invaded country to cede territory, cut its army and pledge never

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