Top US and Ukrainian officials said they were making progress towards ending the Russia-Ukraine war but provided scant details as they discussed the American proposal to achieve peace despite concerns among many of Washington’s European allies that the plan was far too conciliatory to Moscow.

US secretary of state Marco Rubio said high-stakes talks in Geneva were “very worthwhile” and constituted the most productive day in “a very long time” on larger efforts to end the fighting.

“I feel very optimistic that we can get something done,” Mr Rubio said.

But he offered very little information on what was discussed, allowing only that discussions would continue on Monday and perhaps deeper into the week.

He also suggested that Europe’s role and responsibilities as spelled out under the US p

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