A memorandum of understanding signed between the United States and Iran on June 17 initially seemed to accomplish what weeks of military confrontation could not. It extended a ceasefire, reopened diplomatic channels and raised hopes for stability in one of the world's most strategically vital regions.
Early signs were promising. Commercial shipping through the Strait of Hormuz, which carries approximately a fifth of global oil trade, began to recover. Oil flows increased significantly, and Iranian exports more than doubled from their wartime lows under a temporary sanctions waiver. During the week of June 22 to 28, roughly 340 commercial vessels transited the strait, marking the busiest period since hostilities commenced on February 28.
Yet within weeks, ships began vanishing from the strait once again, military exchanges resumed and mediators scrambled to secure another temporary truce simply to salvage the original deal. What had appeared to be a diplomatic breakthrough quickly deteriorated into yet another fragile ceasefire, exposing what analysts describe as the missing half of the mediation process: the parties had agreed on a political text but not on the mechanisms required to enforce it.
Constructive Ambiguity Without Enforcement Mechanisms
Like many ceasefire arrangements, the June MoU relied heavily on constructive ambiguity. Both Washington and Tehran needed enough political flexibility to present the agreement as a victory to their respective domestic audiences while leaving difficult issues unresolved. While such ambiguity can help diplomacy advance when full consensus is impossible, it becomes problematic when no clear mechanisms exist to manage what remains undecided.
The MoU referenced maintaining a nuclear "status quo" without defining which activities were permitted or prohibited. It envisioned sanctions relief without specifying which restrictions would be suspended, under what legal authority, or on what timetable. References to frozen Iranian assets failed to establish how those funds would be released, controlled or monitored. Public discussions suggested approximately $12 billion might eventually become available, yet disagreements quickly surfaced over whether the money would remain in supervised escrow accounts or fall under unrestricted Iranian control.
The maritime provisions exhibited the same weakness. The agreement required Iran to use its best efforts to ensure safe passage for commercial vessels and to engage with the Sultanate of Oman on the future administration of the Strait of Hormuz. However, it established no agreed framework governing navigation, maritime security, inspection procedures, routing arrangements or dispute resolution. The language also allowed Tehran to interpret the text as recognising a future administrative role over the strait.
Commercial Recovery Proves Short-Lived
Commercial traffic initially rebounded because markets responded positively to the ceasefire announcement. Confidence, however, remained fragile because the institutional arrangements necessary to sustain normal shipping had never been agreed upon. Although Washington committed to a temporary 60-day sanctions waiver covering limited oil sales, banking, insurance and shipping activities, many insurers, refiners and shipping companies stayed cautious. A two-month legal window was too brief to justify restoring long-term commercial relationships worth billions of dollars.
Iran did benefit from the respite. During the waiver period, it is estimated to have exported around 70 million barrels of oil, worth approximately $5 billion to $6 billion. Yet oil loaded onto tankers did not necessarily translate into unrestricted funds reaching Tehran. Uncertainty over sanctions, escrow arrangements and banking procedures prevented the commercial recovery from delivering the meaningful economic relief the agreement had envisioned.