Russia on Thursday slammed a plan for European peacekeepers to be deployed to Ukraine as "dangerous" and branded Kyiv and its allies an "axis of war", dousing hopes for a speedy end to the almost four-year-long conflict.

US President Donald Trump has been pushing the warring sides to strike a deal to halt the fighting, running shuttle diplomacy between Ukraine's Volodymyr Zelensky and Russia's Vladimir Putin to try to get an agreement across the line.

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