US-Iran Nuclear Talks Stall Amid Mutual Denials on Sanctions and Enrichment as Oil Markets React

US President Donald Trump on September 28, 2026, publicly denied reports that his administration had offered Iran sanctions relief or the release of frozen assets in exchange for nuclear concessions, stating on Truth Social, 'This is untrue. I offered them NOTHING.' The denial followed stories from Axios and CNN citing unnamed US officials indicating openness to easing sanctions for 'concrete progress' on Iran's nuclear program.

Iranian officials swiftly rejected any suggestion of flexibility. State media including Fars News and Press TV reported that Iran's position on nuclear enrichment remains unchanged, with no current discussions underway. Iranian MP Ebrahim Rezaei and Foreign Minister Abbas Araqchi emphasized that negotiations would not proceed until US commitments from prior understandings are fulfilled.

These developments come against the backdrop of an earlier June 2026 Memorandum of Understanding (MOU) between the US and Iran aimed at ending hostilities, reopening the Strait of Hormuz, and initiating 60-day nuclear talks, which included temporary US sanctions waivers for Iranian oil exports. However, by late September, talks had hit renewed obstacles, with Iran insisting on economic relief prior to nuclear concessions and the US linking any broader deal to verifiable limits on enrichment and stockpiles.

Market reaction was volatile. Initial reports of potential sanctions relief contributed to downward pressure on crude prices, while Trump's rejection of an Iranian proposal for a rapid Hormuz reopening and de-escalation led to sharp gains, with Brent crude rising over 2-3% to above $106-107 per barrel on September 28.

Iran's economy continues to face strain, with the rial hitting record lows. Broader context includes ongoing indirect mediation via Qatar and others, alongside Iranian threats of maritime escalation and persistent IAEA concerns over Iran's nuclear activities and inspector access.

The episode highlights the persistent gap: Tehran seeks sanctions relief and maritime normalization first, while Washington conditions major economic steps on nuclear restraints, complicating any swift resolution by the rumored December 31, 2026 target.