TEHRAN / WASHINGTON — September 16, 2026. Mohsen Rezaei, secretary of Iran’s Supreme National Security Council, rejected talks with the United States on September 15 unless Tehran’s conditions are met first — a hard line that landed hours after President Donald Trump signaled on Truth Social that he is open to the idea that Iran wants a deal, reopening a diplomacy track that kinetic fighting in Hormuz has repeatedly buried.
Rezaei’s formulation was categorical in Iranian media accounts: negotiations are not on the table while American military operations and the maritime blockade continue, while sanctions remain, and while frozen Iranian assets stay locked. Tehran’s publicly reiterated package also includes follow-through on understandings associated with the Islamabad memorandum of understanding track — a diplomatic vehicle Iranian officials have waved as proof that third-party mediation can produce paper before it produces trust. Washington has not endorsed that sequencing.
Trump’s Truth Social posture openness to a concept of Iranian willingness rather than a detailed proposal — fits a pattern of transactional presidential messaging that markets and Gulf capitals parse for leverage. It does not, by itself, authorize a negotiating team or pause CENTCOMs ship redirects. Iranian hardliners read the same posts as pressure to extract concessions without easing the strait; American hawks read Rezaei’s rejection as evidence that Tehran only wants sanctions relief while keeping the blockade card.
Officials around the Supreme National Security Council have spent the Hormuz crisis insisting that any political deal must unwind what they call illegitimate U.S. and allied operations against Iranian coastal and naval assets. Ending the blockade, lifting oil and banking sanctions, and releasing frozen funds are framed in Tehran as restoration of rights, not as bargaining chips. That framing leaves little room for the incremental confidence-building steps diplomats usually prefer after a summer of mine claims, tanker hits, and redirected hulls.
American and Iranian voices diverge on what “open to a deal” even means. Trump’s public language keeps maximum flexibility and maximum ambiguity — useful for domestic politics, frustrating for Oman, Qatar, and Pakistan facilitators who need a clear mandate. Rezaei’s language closes the window unless preconditions are prepaid. The gap between those two styles is where mediation dies: one side wants talks to create conditions; the other wants conditions to create talks.
The Islamabad MoU reference matters because it ties the U.S.–Iran quarrel to a regional facilitation architecture that Gulf states have sometimes backed when direct channels freeze. If Islamabad’s understandings are treated in Tehran as unpaid invoices, every new Trump olive-branch post will be answered with a ledger of unfulfilled items rather than a meeting time. That dynamic favors spoilers in the IRGC Navy and among Iranian officials who profit politically from a permanent war footing in the Gulf.
For oil markets, the Rezaei–Trump exchange is almost as important as tanker counts. A credible negotiation calendar would compress war-risk premiums faster than another week of sparse daytime VLCC traffic; a flat rejection keeps Brent sensitive to every PGSA circular and every CENTCOM statement. Traders have learned since March that presidential social-media openness and SNSC hard stops can coexist for months.
The immediate diplomatic fact is simple. Rezaei said no — until operations end, sanctions lift, assets move, and Islamabad commitments are honored. Trump said he is open to the idea of an Iranian deal. Between those sentences sits the Strait of Hormuz, still far from normal, and a negotiating table that remains empty by design.
