Donald Trump has said he is "very angry" and "pissed off" with Russian President Vladimir Putin after weeks of attempting to negotiate a ceasefire in Ukraine.
In an NBC News interview, the US president criticised Putin for attacking Ukrainian President Volodymyr Zelensky's credibility, and threatened to impose a 50% tariff on countries buying Russian oil if he did not agree to a ceasefire.
Last week, Putin suggested the possibility of a UN-run government in Ukraine to organise new elections and then begin peace talks.
Trump's comments mark a change in tone towards Putin. Over the past six weeks, Trump has publicly harangued Zelensky and demanded numerous concessions from Ukraine's president.