Iran's Supreme Leader Mojtaba Khamenei said that President Trump's signature is worthless and invalid in a message directed at the United States [1, 2].

This escalation marks a significant breakdown in diplomatic efforts between Tehran and Washington. By suspending commitments under a recent interim agreement, Iran has removed a key diplomatic guardrail, increasing the risk of direct military confrontation.

Khamenei said the warning from Tehran in response to escalating tensions and continued attacks [1]. The Supreme Leader said that the U.S. would face severe consequences if the current trajectory of aggression persists [1].

"Your signature is worthless and invalid," Khamenei said [1].

The leader said that the U.S. would learn "unforgettable lessons" if it continues its attacks [1]. These statements accompany the formal suspension of Iran's obligations under the interim deal, a move that effectively halts the progress of the short-term framework intended to stabilize the region [1, 2].

Tehran has not specified which particular attacks triggered the latest warning, but the rhetoric suggests a total collapse of trust in the executive agreements signed by the U.S. administration [1]. The suspension of the interim agreement means Iran may no longer adhere to the specific constraints, or timelines, previously negotiated to limit its nuclear or military activities [1].

U.S. officials have not yet provided a formal response to the Supreme Leader's remarks or the suspension of the agreement [1, 2].

"Your signature is worthless and invalid."

The suspension of the interim agreement signifies a shift from managed tension to active diplomatic rupture. By publicly delegitimizing the U.S. president's signature, Iran is signaling that it no longer views the current administration as a reliable partner for treaty-based stability, likely pivoting toward a more aggressive posture to deter further U.S. actions.