Tensions are rising between the US and Ukrainian presidents.
In a post on social media network Truth Social, Donald Trump has labelled Volodymyr Zelensky a dictator without elections, who's duped the US into spending billions of dollars in defence against Russia.
It comes hours after Zelensky accused him of repeating Russian disinformation.
US correspondent Mitch McCann told Andrew Dickens this comes at a delicate time.
He says the US is looking to negotiate with Russia without Ukraine at the table and Ukraine is getting impatient.
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