Mr Trump's latest comments - in which he also calls Mr Zelenskyy "a dictator without elections" - come after the Ukrainian prime minister accused him of living in a Russian-made "disinformation space" as a result of his administration's discussions with Kremlin officials.
Donald Trump has said Volodymyr Zelenskyy "better move fast or he is not going to have a country left" as peace talks between the US and Russia continue – without Ukraine at the table.
Mr Trump continued: "Zelenskyy better move fast or he is not going to have a country left.
The decision for the talks to take place without representatives from Kyiv or Europe has caused concern, and sparked an emergency meeting of European leaders in France earlier this week.
In a post on his social media platform TruthSocial, the US president said Mr Zelenskyy had "done a terrible job".
