Donald Trump has said the US will "take a pass" on brokering further Russia-Ukraine talks if Moscow or Kyiv "make it very difficult" to reach a peace deal.
The US president told reporters in the Oval Office on Friday that he was not expecting a truce to happen in "a specific number of days" but he wanted it done "quickly".
His comments came hours after US Secretary of State Marco Rubio warned that the US would abandon talks unless there were clear signs of progress within days.
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