July 18 (Reuters) – ⁠Iran’s ⁠Supreme Leader ⁠Mojtaba Khamenei said in ​a written statement ‌on Saturday that repeated ‌U.S. ⁠breaches ⁠of a memorandum of understanding signed ​by the presidents of Iran and the ​United States had shown ⁠that President ⁠Donald Trump’s ⁠signature was “utterly ​worthless and devoid of ​credibility.”

Washington and ⁠Tehran have exchanged strikes after a ceasefire ⁠agreement fell apart last week, raising fears ⁠of a return to all-out war.

Khamenei said the United States should know that the Iranian nation and the “resistance front” ⁠had “unforgettable lessons” for it.

(Reporting by Enas Alashray, Hatem Maher and Yasmine ​Ghania; Editing by ​Ros Russell)

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