Zelensky cannot afford to be humbled into an abject apology. After three years of Russian bombardment, Ukrainians are not in the mood for capitulation. But he would have to find a form of words sufficient to appease Trump. He might also have to accept a ceasefire on Trump's terms, even if he still believes peace is "very, very far away".

The order will remain in effect until Trump determines that Ukraine has demonstrated a commitment to peace negotiations with Russia, an official said.

Withholding aid is another sign that the relationship between the Trump administration and Ukrainian leadership has deteriorated.