The feud between President Trump and President Volodymyr Zelensky escalated rapidly on Wednesday, with Trump calling him a “Dictator without Elections” and Zelensky accusing Trump of repeating Russian propaganda.

The back-and-forth barbs marked a significant deterioration in relations that could complicate efforts to end the war in Ukraine. The exchange came one day after Trump accused Zelensky of starting the war, which began after Russian President Vladimir Putin ordered a large-scale invasion of Ukraine three years ago.

Zelensky told reporters in Ukraine earlier Wednesday that Trump is “living in this disinformation space.” He added, “I want there to be more truth in Trump’s team.”