US-Iran Ceasefire and MoU Expire Without Deal as Hormuz Crisis Deepens
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The 60-day U.S.-Iran interim framework has expired without producing a broader agreement, leaving Washington and Tehran further apart as the crisis around the Strait of Hormuz intensifies. The memorandum, signed in June, was intended to halt hostilities and create time for negotiations on a wider settlement. Instead, disagreements over the Strait, sanctions, Iran’s nuclear program and the future of the ceasefire have pushed the two sides into a more dangerous phase.
By August 17, President Donald Trump had rejected extending the June arrangement, while a senior Iranian official warned that Tehran would move toward a “fully offensive” military posture if diplomatic efforts failed. On August 18, Trump said there were no talks with Iran taking place or scheduled, while Iran’s top negotiator Mohammad Baqer Qalibaf said the Strait of Hormuz would remain closed until Washington met Tehran’s conditions.
The Ceasefire Framework Has Expired Without a New Agreement
The June memorandum was designed to provide a 60-day period for negotiations toward a broader agreement, including issues surrounding Iran’s nuclear program and the wider conflict. However, the framework began to unravel over disagreements about control and access to the Strait of Hormuz.
Trump declared the agreement over on July 7, and Iran later announced its suspension. By the time the 60-day period expired, there was no replacement agreement capable of restoring a stable diplomatic process.
The collapse of the framework does not necessarily mean that every channel of communication has disappeared. Trump’s special envoy Jared Kushner said on August 17 that conversations involving different parts of the Iranian government were still active. Trump, however, said the following day that no talks were taking place or scheduled. The conflicting statements highlight how uncertain the diplomatic situation has become.
Hormuz Has Become the Main Pressure Point
The Strait of Hormuz is now at the center of the confrontation because its status directly affects global energy and shipping markets. Iran says the waterway will remain closed until the United States meets conditions including lifting its blockade of Iranian ports, removing oil sanctions, releasing frozen Iranian assets and ending military threats and operations against Iran.
Trump, by contrast, has said that Hormuz is open and operating and that the U.S. naval blockade remains in force.
The competing claims are having a practical effect even without a complete halt in shipping. Kpler data cited by Reuters showed that only six commodity vessels crossed the Strait on August 19, compared with nine the previous day and a recent 10-day average of 11. Before the conflict, more than 130 vessels a day passed through the waterway.
The decline is particularly significant because Hormuz historically carries about one-fifth of global crude oil and liquefied natural gas shipments. With shipping companies facing military, insurance and security risks, a waterway can remain technically navigable while becoming commercially difficult to use.
Shipping Companies Are Already Changing Their Routes
The uncertainty around Hormuz has begun to change the behavior of major shipping companies. Reuters reported that two large Chinese state-owned shipping companies have stopped sending vessels through both Hormuz and the Bab el-Mandeb because of security concerns.
Some cargoes are instead being transferred between ships outside the Gulf, including around Fujairah and Oman. These alternatives can keep some energy supplies moving, but they also increase logistical complexity, costs and exposure to delays.
The result is a wider economic problem. Energy companies and shipowners must consider not only whether a route is physically open, but whether the cost of insurance, security and delays makes using it commercially viable.
Oil Markets Are Pricing in a Longer Crisis
Oil markets have responded to the growing uncertainty. Brent crude closed at around $91.02 a barrel on August 18, while U.S. West Texas Intermediate settled near $84.94. Both benchmarks were at their highest levels in more than three weeks.
The rise reflects concerns that the disruption around Hormuz could continue rather than being resolved quickly. Saudi Aramco has resumed some oil loading through offshore transfers, while Chinese buyers have collected some crude outside the Gulf, helping reduce immediate supply fears without restoring normal traffic through the Strait.
If the disruption persists, the economic effects could extend beyond crude prices. Higher war-risk insurance, tanker rates, freight costs and longer delivery routes can increase the cost of energy and other goods. For major importers, that can create additional inflation pressure even if global oil production itself does not fall by the same proportion as shipping through Hormuz.
Iran Signals a Harder Military Posture
The diplomatic breakdown has also been accompanied by increasingly aggressive military warnings from Tehran.
A senior Iranian official told Reuters on August 17 that Iran would move toward a “fully offensive” military posture because negotiations aimed at ending the conflict had stalled. The official said Tehran was prepared to take what it described as timely and precise military action if diplomacy failed.
The warning does not by itself establish that a new major offensive has begun. However, it increases the risk surrounding a maritime corridor where commercial traffic is already severely reduced.
For Washington, maintaining pressure on Iran may be intended to strengthen its negotiating position. For Tehran, restrictions on Hormuz provide significant leverage because of the waterway’s importance to global energy markets. But prolonged disruption also carries risks for Iran and neighboring economies that depend on regional trade.
Diplomacy Faces a Narrower Path Forward
The central question is now whether Washington and Tehran can establish a new negotiating mechanism after the collapse of the June framework.
Turkey’s President Tayyip Erdogan has urged Trump to pursue talks with Iran and offered Turkey’s support for diplomatic efforts. Regional states including Oman, Pakistan and Qatar have also remained important to the broader diplomatic environment.
At the same time, the proposed Iran-Oman mechanism for managing maritime traffic through Hormuz remains one of the few practical efforts focused directly on restoring commercial navigation. Reuters reported earlier that the proposal could involve Iran managing ships entering the Gulf while Oman manages traffic moving in the opposite direction, although important details remained unresolved.
Such arrangements could potentially improve shipping access without requiring an immediate comprehensive peace agreement. However, Washington has opposed giving Iran control over international shipping through the Strait or allowing transit fees, leaving the proposal politically sensitive.
What Happens Next?
The next phase of the U.S.-Iran confrontation will be determined by several indicators: whether diplomatic contacts become more formal, whether shipping through Hormuz begins to recover, whether Iran follows through on its offensive warning, and whether Washington changes its position on the expired interim framework.
Oil prices and shipping costs will also remain important signals. A sustained recovery in vessel traffic would suggest that commercial operators are becoming more confident about the route. Continued low traffic, however, would indicate that the security crisis is becoming embedded in global energy logistics.
For now, the expiration of the 60-day framework has not produced a new diplomatic settlement. Instead, the crisis has shifted toward a more uncertain phase in which military pressure, economic sanctions, shipping restrictions and diplomatic efforts are all operating simultaneously.
Unless Washington and Tehran find a workable channel for negotiations, the collapse of the June agreement could turn what was originally intended to be a temporary pause into a longer period of confrontation, with consequences reaching far beyond Iran and the United States
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