The Collapsing Iran Ceasefire: Why the U.S. Reimposed Oil Sanctions and What's Blocking a Hormuz Deal

Here is what the June MOU actually contained, why the sanctions revocation matters, and the unresolved disputes that now threaten any final deal.

The June 17 MOU: The Ceasefire That Didn't Last

On June 17, 2026, President Donald Trump and Iranian President Masoud Pezeshkian signed a 14-point Memorandum of Understanding . Its central provisions were:

• Ceasefire and withdrawal: Immediate and permanent termination of military operations on all fronts, including in Lebanon .
• Reopening the Strait of Hormuz: The U.S. agreed to remove its naval blockade. Iran committed to making "arrangements for the safe passage of commercial vessels with no charge, for 60 days only" .
• Oil sanctions relief: The U.S. committed to lift sanctions on Iranian oil exports. On June 22, the Treasury issued a general license enabling Iran to sell crude and petrochemicals on international markets .
• Nuclear talks framework: The MOU opened the door to longer-term negotiations on Iran's nuclear program, to be addressed in later stages .
• Three-stage architecture: The agreement envisioned a formal end to the war, resolution of the Strait of Hormuz crisis, and then broader nuclear negotiations .

At one point, at least three competing texts of the MOU were circulating — all containing similar elements around reopening the strait, sanctions relief, and nuclear talks, but differing on sequencing and scope .

Why the July 7 Sanctions Revocation Was a Watershed

On July 7, 2026, three commercial vessels were hit by projectiles in or near the Strait of Hormuz — an LNG tanker, an oil supertanker, and a third vessel . The U.S. responded by revoking the Treasury general license that authorized Iranian oil sales, with an effective wind-down date of July 17 . Simultaneously, U.S. Central Command announced strikes on Iranian air defense systems, command-and-control networks, coastal radar sites, anti-ship missile capabilities, and more than 60 Islamic Revolutionary Guard Corps small boats .

Why it matters: Oil sanctions relief was Iran's primary economic incentive for reopening the Strait of Hormuz. By revoking the license, Washington signaled it viewed the tanker attacks as a material breach of the ceasefire . The U.S. Treasury stated that "Iran will only reap benefits if they exhibit good behavior" . Iran responded that there would be "no talks unless Trump halts military action" .

The Four Sticking Points Blocking a Final Deal

Even before the July 7 escalation, negotiations were faltering. Four core disputes remain unresolved:

1. Iran's plan to bar U.S. and Israeli ships

As of August 6–7, 2026, Iran's parliamentary National Security Committee is reviewing a preliminary bill that would:

• Bar U.S., Israeli, and other "hostile" vessels from transiting the Strait of Hormuz
• Impose fines of up to 20% of a ship's cargo value for violations
• Require compensation from "hostile countries" before passage is permitted

Iran also claims it has reached an agreement with Oman on a proposed shipping route that would exclude U.S. and Israeli ships . The U.S. has flatly rejected any arrangement that restricts freedom of navigation. A U.S. official told CNBC: "Any temporary routes will be without any impediments — meaning no approvals or permissions and no tolls or charges. The Strait of Hormuz is an international waterway and no party controls the lanes or the ability to transit through them" .

2. Competing texts of the deal

At one point, at least three competing versions of the MOU were circulating — all containing similar elements around reopening the strait, sanctions relief, and nuclear talks, but differing on sequencing and scope . This has fueled accusations that each side is operating from a different understanding of what was agreed.

3. Iran's frozen overseas assets

Iran is also prioritizing the release of its frozen overseas assets, a demand that remained unresolved even as the June MOU was signed . Talks in Doha on July 1 concluded with no sign of headway toward a lasting peace, as both sides accused each other of backsliding on commitments already thought resolved .

4. Fragile ceasefire and risk of relapse

After the July 7 sanctions revocation and U.S. strikes, Iran's leadership said there would be "no talks unless Trump halts military action" . Qatari and Pakistani mediators are working to restore the ceasefire, reporting "progress" as of August 4, but the core dispute over who controls the Strait and under what rules remains unresolved .

Bottom Line

The renewed U.S. oil sanctions mark a severe setback to the June MOU. A final deal to reopen the Strait of Hormuz is stalled over Iran's demand to exclude U.S. and Israeli vessels, Tehran's insistence on unfrozen assets, and mutual recriminations over ceasefire violations. Mediation efforts by Qatar, Pakistan, and Oman continue, but the agreement's future remains uncertain. For global energy markets, the stakes are enormous: the Strait of Hormuz is the conduit for roughly one-fifth of the world's oil and liquefied natural gas .