It was a striking contrast to the meeting six months ago, when Trump, red-faced and angry, accused an agitated Zelensky of failing to show enough gratitude to the United States. The blowup was so heated that the Ukrainian delegation was sent from the White House without being allowed to eat their waiting lunch.

The last time they met in the Oval Office, it ended in an argument in front of the world's media. It was a friendlier encounter this time, with Zelensky handing a letter to Donald Trump from his wife to the First Lady, Melania Trump.

Safavi's warning underscores the fragility of the ceasefire and the ongoing risk of renewed conflict. The June confrontation caused hundreds of deaths and thousands of injuries, with Israeli strikes hitting Iranian nuclear facilities and senior military command centers.