U.S. Secret Ship‑to‑Ship Oil Transfers Reveal Hidden Battle Over Hormuz
A Reuters investigation says the U.S. quietly ran a network of ship‑to‑ship oil transfers off the UAE and Oman since early May to keep Gulf exports flowing despite Iran’s disruption of traffic through the Strait of Hormuz. The operation mirrored tactics long used by Tehran to evade sanctions, even as Washington publicly ramped up pressure on Iran. This analysis shows how both sides fought a shadow logistics war to keep the world’s energy artery open.
While warships and missiles grabbed headlines in the Gulf this spring, the real battle for the world’s energy artery was being fought between tankers in the dark. Since early May, the United States has been quietly overseeing a large offshore oil‑transfer network off the coasts of Fujairah in the United Arab Emirates and Sohar in Oman to keep Gulf exports moving despite Iranian disruption of traffic through the Strait of Hormuz, according to a detailed investigation.
The operation relied on ship‑to‑ship transfers at sea, a technique long associated with Iran’s own efforts to move crude under sanctions. In this case, tankers would load oil at regional ports, sail to designated offshore areas, and transfer their cargoes to larger vessels that could then continue on to global markets without passing directly through chokepoints where they might be more vulnerable. U.S. military oversight provided a security umbrella and coordination, even as Washington publicly condemned Iran’s actions and built up its naval presence in the area.
For tanker crews and shipping companies, the arrangement turned routine voyages into high‑stakes maneuvers. Conducting ship‑to‑ship transfers on the open sea requires precise handling, cooperative weather, and strict safety protocols to avoid spills or collisions. Doing so under the implicit protection of the U.S. military, in waters where Iranian forces had been actively challenging traffic, added an extra layer of pressure. But the alternative — allowing exports to back up and prices to spike — was deemed politically and economically unacceptable in Washington and in key consuming states.
The stakes for global markets were clear. As Iran disrupted shipping and the U.S. imposed a naval blockade on Iranian ports, traders and governments braced for a potential supply shock. Instead, the covert transfer network acted as a pressure valve, keeping crude and products flowing out of the Gulf even as the surface narrative was one of confrontation and brinkmanship. Brent crude still climbed on fears of escalation, but the quiet workarounds likely prevented a sharper spike and limited the blowback to Western economies.
Strategically, the revelation that Washington adopted Iran’s own playbook exposes a less visible dimension of power in sanctions warfare: logistics. Sanctions aim to choke off adversaries’ revenue, but they also risk collateral damage if they disrupt broader energy flows. By institutionalizing ship‑to‑ship transfers under military oversight, the U.S. effectively created a sanctioned and unsanctioned track in the same waters — constraining Iran while protecting friendly exporters. It is a reminder that sanctions enforcement is not just about laws and lists but about who can organize the safest, most reliable routes under pressure.
The disclosure comes as Washington and Tehran move in the opposite direction diplomatically. With a memorandum of understanding due to be signed in Switzerland and the U.S. lifting its naval blockade of Iranian ports, at least five Iranian vessels have already crossed Hormuz and Iranian tankers are resuming shipments. Trump now promises the strait will be “fully open” and “permanently toll‑free,” a radical shift from the climate in which the ship‑to‑ship network was conceived. The offshore choreography that defined the last months of confrontation could soon give way to more straightforward use of the strait — unless the deal falters.
For Iran, learning that the U.S. mirrored its methods is a double‑edged realization. On one hand, it validates the effectiveness of techniques Tehran honed under sanctions. On the other, it shows that Washington can co‑opt those methods at scale to blunt the impact of Iranian moves at Hormuz. The message to other sanctioned or sanction‑threatened states is clear: the real contest is no longer only about whether tankers move, but under whose rules and with whose escort.
Hormuz risk does not have to close the strait to matter; it only has to change the routes, costs, and political bargains required to keep oil flowing. The next things to watch are whether the U.S. mothballs its ship‑to‑ship network as the new Iran agreement takes effect, if commercial operators continue to favor offshore transfers as a hedge against future crises, and how quickly insurance rates and freight patterns adjust to a waterway that is officially open but newly politicized.
Sources
- OSINT