Donald Trump risks being a "loser president" if he wins November's election and imposes a bad peace deal on Ukraine, Volodymyr Zelenskiy has said, saying it would mean the end of the US as a global "player".

In an interview with the Guardian in Kyiv, Zelenskiy said he had "no strategy yet" for what to do if Trump returned to the White House, and that the former British prime minister Boris Johnson had approached him on his behalf.

If Trump beats Joe Biden, he is widely expected to cut off US military support to Ukraine. Last year Trump boasted he could end the war in "24 hours".