Iran's 60-day deal locks in Persian Gulf leverage over US rivals

The memorandum of understanding signed last week between Washington and Tehran did more than reopen the world's most critical oil chokepoint. It set the stage for Iran to formalize its influence over the Strait of Hormuz — a waterway carrying roughly a fifth of global petroleum liquids — through bilateral talks with Oman, sidelining both the US and Gulf Arab states that have long relied on American naval power to keep the passage open.

"The Islamic Republic has achieved what Shah Mohammad Reza Pahlavi only dreamed of — effective control of the Gulf," wrote Reuel Marc Gerecht, a resident scholar at the Foundation for the Defense of Democracy, and Ray Takeyh, a senior fellow at the Council on Foreign Relations, in a Wall Street Journal op-ed published Wednesday. "The Islamic Republic intends to prove the opposite — that at last the West has been broken."

The MOU's language on the strait is unambiguous. It states that Iran "will conduct dialogue with the Sultanate of Oman to define the future administration and maritime services in the Strait of Hormuz, in discussion with other Persian Gulf littoral states." The US, which enforced a naval blockade of Iranian ports for months and lost 15 service members in the conflict, is not a party to those talks. Iran's parliament speaker and chief negotiator Mohammad Bagher Ghalibaf announced Tuesday that Tehran and Muscat have already formed a joint committee to administer the waterway.

The implications extend well beyond shipping lanes. Javan, a newspaper affiliated with the Islamic Revolutionary Guard Corps, laid out the emerging order on June 15, declaring that Gulf states "had no choice but to engage positively and constructively with Iran" and that "from now on, the Persian Gulf will be influenced by political and security arrangements centered on Iran." For Saudi Arabia, the UAE and other Gulf monarchies that have banked on US security guarantees since the 1991 Gulf War, the message is a direct challenge to the region's post-Cold War order.

Oil flows resume, but the risk premium remains

The immediate market impact has been a relief rally in crude. Brent crude traded at $79.43 a barrel as traders weighed the durability of the ceasefire, according to Reuters. Trump claimed on Truth Social that 19 million barrels of oil passed through the strait in a single day — a figure that, if accurate, would match pre-war daily flows of 17 million to 20 million barrels. Kpler data showed 39 vessels transited the strait on Monday, the highest since the war began but still far below pre-conflict volume.

Yet the structural risk has not dissipated. The MOU grants Iran a 60-day window to sell oil without US sanctions — the Treasury issued a general license permitting Iranian crude sales through Aug. 21 — while Tehran simultaneously asserts the right to close the strait if it deems the ceasefire violated. Iran's military command posted Sunday that the waterway "will be closed to vessel traffic," a threat that briefly disrupted shipping before traffic resumed. The pattern of open-and-close coercion, which Iran deployed earlier over the conflict in Lebanon, gives Tehran a lever it can pull at will.

For investors, the key question is whether the 60-day window leads to a permanent settlement or becomes a periodic crisis cycle. The last time Iran threatened to close the strait at scale — during the 2019 tanker seizures — crude prices spiked 15 percent over six weeks while maritime insurance premiums tripled. This time, the stakes are higher: Iran has demonstrated it can sustain a blockade for months, and the US has shown no appetite for the ground commitment needed to hold the waterway permanently.

A weaker US hand, a stronger Iranian narrative

Perhaps the most consequential provision of the MOU is the mutual recognition clause: "The Islamic Republic of Iran and the United States undertake to respect each other's sovereignty and territorial integrity and to refrain from interfering in each other's internal affairs." For a US president who called for regime change in Tehran five months ago, the concession is striking. It effectively legitimizes the Islamic Republic's territorial claims over the strait — claims that Washington spent decades contesting.

The financial flows reinforce the asymmetry. Iran obtained the immediate release of $12 billion in frozen assets through Qatar's mediation, with no restrictions on how the funds can be spent, according to Tehran. Trump insisted the money goes into US-controlled escrow for purchases of American agricultural goods — a contradiction that underscores the deal's fragility. Meanwhile, the Iranian rial has become essentially worthless and the economy is in freefall, per pro-US analysts, giving Tehran every incentive to extract maximum concessions before the 60-day clock runs out.

The S&P 500 has closed with 20 new highs since the conflict began Feb. 28, suggesting US equity markets have largely priced out the war risk. But the geopolitical risk premium embedded in crude options and Gulf sovereign credit default swaps tells a different story. If Iran's strategy of calibrated disruption succeeds, the 60-day pause may be remembered not as a ceasefire but as the moment the US ceded control of the world's most important energy artery.

This article is for informational purposes only and does not constitute investment advice.