• Vice President JD Vance said Iran must 'behave' for any deal, reinforcing Washington's stance that sanctions relief depends on verified conduct.
  • Indirect U.S.-Iran talks in New York are racing against a de facto deadline, with Iran expecting a U.S. response to its revised Hormuz proposal by Tuesday.
  • Oil markets remain on edge: Brent settled at $105.28 on September 28, and the IMF warns depleted buffers leave the global economy more exposed to a fresh supply shock.

A Conditional Path to Relief

Vice President JD Vance’s blunt formulation — “Iran must behave for there to be any kind of deal” — is more than rhetoric. It codifies the administration’s position that Tehran will not receive immediate, unconditional economic benefits, according to people familiar with the matter. Any sanctions relief, access to frozen assets, or longer-term normalization would hinge on verified behavior, a stance that has become the central fault line in the renewed, mediator-led effort to end the U.S.–Iran conflict.

The immediate backdrop is a fragile diplomatic push. U.S. and Iranian officials have been holding separate indirect talks with Qatari mediators in New York, where Iran submitted a revised, roughly seven-day framework intended to reopen the Strait of Hormuz. Iranian Foreign Minister Abbas Araghchi reportedly expected a U.S. response by Tuesday. President Trump had rejected an earlier Iranian proposal, but mediators continue to pursue a phased arrangement: Iran would reopen shipping lanes, while Washington could ease its naval blockade and eventually consider sanctions relief.

Major gaps remain, particularly over Iran’s nuclear program and the sequencing of concessions. The earlier U.S.–Iran memorandum of understanding, signed in June and meant to sustain a 60-day negotiating process, broke down within weeks and formally expired in August. Its central premise was conditionality — economic benefits only if Iran complied with commitments on nuclear activities, regional conduct, and maritime access.

Economic Stakes Anchored in Hormuz

The Strait of Hormuz is the economic fulcrum. It historically carries about one-fifth of global oil consumption, and the disruption has had a direct effect on crude prices, shipping, insurance costs, and energy-importing economies. On September 28, Brent settled at $105.28 per barrel and WTI at $92.60 as worries over continued supply disruption outweighed hopes for diplomacy. Flows were recovering but remained constrained; one estimate projected September shipments around 7.4 million barrels per day.

The IMF estimated that the effective closure of Hormuz had cut off around 20 million barrels per day of crude and refined products. By end-May, more than 1.1 billion barrels had failed to reach markets. The fund’s core warning is that the market initially absorbed much of the shock using inventories, demand compression, and spare production capacity, but those buffers have diminished. That leaves the world economy more exposed if shipping disruptions intensify again.

For Iran, an agreement could unlock access to frozen assets, restore oil exports, and reduce the economic damage from sanctions and the blockade. For the United States and allies, the potential gains are freer shipping, lower energy-price risk, and a more controlled path for addressing Iran’s nuclear activities.

The Order of Operations

The dispute is fundamentally about sequencing. Iran wants concrete relief from the U.S. blockade and sanctions, while the United States wants Tehran to make — and verifiably keep — security commitments before it confers lasting benefits. Key U.S. demands associated with the June framework and Vance’s remarks include no Iranian nuclear weapon and a process for addressing highly enriched uranium stockpiles; reopening and maintaining safe passage through Hormuz; an end to conduct Washington characterizes as support for regional militant or terrorist groups; and compliance mechanisms strong enough to prevent Iran from receiving relief without delivering material changes.

The nuclear issue remains especially difficult. The International Atomic Energy Agency has warned that it lacks sufficient access to verify Iran’s nuclear material and facilities. IAEA Director General Rafael Grossi said Iran still possesses a significant quantity of uranium enriched to 60% and that inspectors have lost access needed to establish the status of material and damaged facilities. That verification gap makes a durable agreement much harder: sanctions relief or a ceasefire alone would not answer the central proliferation concern.

The diplomacy also has implications for U.S. relations with Israel and Gulf states. Vance publicly criticized Israeli opposition to the June arrangement, arguing that critics should not undermine Washington’s diplomatic effort, while Israeli officials and other skeptics have questioned whether Tehran would actually change its behavior. The administration’s approach resembles earlier cycles in U.S.–Iran diplomacy: pressure through sanctions and military deterrence combined with efforts to trade nuclear constraints for economic normalization. The major precedent is the 2015 Joint Comprehensive Plan of Action, which exchanged limits and monitoring on Iran’s nuclear program for sanctions relief; the U.S. later withdrew, and the arrangement subsequently unraveled.

Market Volatility and Regional Risk

Oil prices have swung sharply as negotiations advance or stall; Brent fell on ceasefire hopes and rose again after proposals were rejected or attacks threatened regional supply. Investors now price geopolitical headlines directly into energy markets. The impact reaches households through gasoline, diesel, heating, airfares, and more costly transported goods, with particular intensity in oil-importing emerging markets. Shipping firms and seafarers face security risks, rerouted vessels, elevated insurance premiums, and uncertain access through Hormuz. Gulf producers such as Saudi Arabia and Qatar face disrupted export routes, though some alternative pipeline capacity and gradual shipping recovery have mitigated part of the strain.

The most plausible near-term outcome is continued indirect diplomacy punctuated by market volatility. A limited arrangement to improve maritime passage and reduce immediate military escalation is more achievable than a comprehensive nuclear settlement, because it offers quick benefits to both sides: safer shipping for the world economy and a possible path toward economic relief for Iran. However, Iran has indicated it will not show flexibility on its nuclear program merely in exchange for a reopening arrangement, and the U.S. has rejected at least one recent proposal, suggesting disagreement over sequencing or terms remains unresolved.

A durable settlement would likely require four linked components: verified nuclear restrictions, reliable IAEA access, secure Strait of Hormuz transit, and a staged sanctions-relief mechanism that can be reversed if Iran breaches commitments. The economic incentive is powerful, but so is the mistrust accumulated through prior agreements, sanctions, attacks, and failed negotiations. If talks succeed, the likely effects would include lower geopolitical risk premiums in oil prices, more dependable Gulf exports, eased pressure on global inflation, and a diplomatic channel for nuclear oversight. If talks fail, renewed military escalation, prolonged energy-market instability, tighter sanctions, and further degradation of nuclear transparency become more likely.

In short, Vance’s headline frames the administration’s negotiating theory: economic relief is conditional, not automatic. The practical test will be whether Washington and Tehran can agree on what “behave” means, how it is independently verified, and which side moves first.

Correction: An earlier version of this article misstated the date of the June framework’s formal expiration. It expired in August, not July.