US–Iran MOU Negotiations Deadlocked — Trump Reportedly Rejects Iran's Response as 'Totally Unacceptable'; Markets React Negatively

On May 11, 2026, U.S.–Iran MOU negotiations hit a significant impasse. According to NBC News, Time, and The National, President Trump reportedly rejected Iran's formal counterproposal — submitted via Pakistan's back-channel on May 10 (Bloomberg/IRNA) — as 'totally unacceptable,' accusing Tehran of 'playing games.' Iran's counterproposal reportedly expanded far beyond the narrow one-page U.S. MOU framework: while the U.S. proposed a focused declaration ending hostilities and opening a 30-day negotiating window covering freedom of Hormuz navigation, nuclear limits, and sanctions relief, Iran's response reportedly included demands for comprehensive sanctions relief, release of frozen funds, security guarantees against future U.S. and Israeli military strikes, and — most controversially — a potential Iranian role in managing Hormuz transit. The core sticking points: (a) scope divergence — the U.S. wants a narrow ceasefire-first MOU, Iran seeks a broad regional security settlement; (b) sequencing — both sides attempt to lock in concessions before committing; (c) internal Iranian fragmentation between IRGC hardliners and diplomatic channels, with Supreme Leader Khamenei's ultimate approval required for any signed agreement. Treasury yields moved higher on May 11 as markets registered the breakdown of MOU optimism following Iran's formal submission 24 hours earlier. Trump is traveling to China this week, pursuing parallel diplomatic channels. The Strait of Hormuz remains closed; approximately 750 vessels are trapped and U.S. gas prices remain at $4.45/gal — the highest since July 2022. The Iran nuclear track has now experienced three major setbacks in May 2026: the Islamabad Round 2 abort (April 26), the 14-point proposal rejection (May 2-3), and now the MOU round deadlock.