Oman halts cooperation with US on oil tanker escorting through Strait of Hormuz
The sultanate's pivot away from Washington reshapes the security calculus for the world's most important oil chokepoint
Oman has stopped cooperating with the United States on escorting oil tankers through the Strait of Hormuz, a rupture in one of the longest-standing security partnerships in the Persian Gulf. The move effectively leaves Washington without its most reliable regional partner in protecting the narrow waterway that handles roughly 20% of the world’s oil and liquefied natural gas trade.
What’s behind the split
The breakdown didn’t happen overnight. It’s the product of a slow-burning realignment that accelerated after the US-Iran conflict and a ceasefire reached on April 8, 2026.
In the months since, Oman has pursued independent arrangements with Iran to establish safe passage corridors for commercial vessels. The two countries issued a joint statement in June 2026 affirming sovereignty over their respective territorial waters in the strait.
The US has scaled back its direct naval escort operations in the region. Formal escort missions have been paused since May 2026, though the military has maintained some protective operations on Oman’s southern routes, including drone intercepts and air cover.
Oman’s Foreign Minister has stated that the Sultanate supports fee-free maritime navigation, positioning Muscat as a neutral guarantor of open passage. US officials have rejected any framework that grants Iran influence over navigation within the strait. Washington has gone further, threatening sanctions against Oman for what it sees as enabling potential Iranian controls over the waterway.
The maritime fallout
Tanker traffic through the strait has fallen to a fraction of pre-crisis levels. War-risk insurance premiums have climbed sharply, adding significant costs to every barrel that passes through the chokepoint.
The news moving money, markets, and the world—before your day starts.
Daily. Free. Join 34,000+ readers across crypto, finance, and policy.
In June 2026, an attack on a Singapore-flagged vessel near Oman prompted the International Maritime Organization to pause its voluntary evacuation and escort initiatives in the region, further chilling commercial shipping activity through the strait.
Oman has been coordinating temporary navigation corridors with the IMO without imposing transit fees. The historical relationship between the US and Oman included significant military access agreements that gave American forces basing rights and logistical support across the sultanate.
Energy market implications
The strait handles roughly a fifth of the world’s oil and LNG through a passage barely 21 miles wide at its narrowest point. The combination of reduced tanker traffic, elevated insurance costs, and an uncertain security environment creates sustained oil price volatility. Shipping companies are already rerouting vessels or delaying transits, adding time and cost to supply chains.
A mediator’s gamble
Oman has long positioned itself as the Gulf’s quiet diplomat, including facilitating the early back-channel discussions that led to the 2015 nuclear deal.
This latest move represents a more assertive version of that playbook. Rather than simply facilitating dialogue between larger powers, Oman is now actively shaping the security architecture of the strait itself. If US sanctions materialize, they could damage the sultanate’s economy and its carefully cultivated reputation as a neutral player.