LONDON, March 4 (Reuters Breakingviews) - Donald Trump is waking up to the fact that cutting off the world’s largest oil and gas shipping route has dire consequences. That’s clear from his scramble to restart flows through the Strait of Hormuz ​by offering insurance, opens new tab for tankers and dispatching U.S. Navy escorts. The idea evokes the late-1980s “Tanker War”, when Washington protected oil shipments during the Iran-Iraq ‌War. But this time a quick fix is unlikely.

Traders rely on the narrow channel at the end of the Arabian Gulf to transport a fifth of the world’s oil and gas. Just days after an audacious attack on Iran that effectively halted trade flows, Trump rushed to reassure them of U.S. help. Firstly, he is offering to underwrite risks that private insurers no longer ​want to bear via the U.S. International Development Finance Corporation (DFC). The entity is authorised to provide $1 billion in political risk insurance per entity, well ​above the value of a typical new tanker costing up to $120 million, per Evercore analysts. It currently has a total ⁠maximum liability of $205 billion.

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In theory, such coverage could coax reluctant tanker owners back into the Gulf. In practice, the opposite looks likely. Freight rates for very large ​crude carriers have nearly doubled since January, while many war-risk insurers are pulling back entirely. A government guarantee might cover financial losses, but it does little to counter ​threats of drones, sea mines and Iranian-led forces. A subsidiary of China’s state-owned COSCO Shipping, hours after the DFC announcement, suspended, opens new tab all new booking services for relevant routes.

Operational snags loom as well. The DFC’s insurance product may still require lengthy approvals, Evercore reckons. Tanker operators, meanwhile, must decide now whether it is worth the danger.

And even if financial cover materialised quickly, military protection ​may be even trickier to pull off. During the 1980s Iran-Iraq war, the U.S. led escort operations but had a larger fleet and could present itself as ​a semi-neutral guardian of shipping lanes. Today the U.S. Navy has fewer available assets, according to AXSMarine analysts, while Washington is a direct participant in the confrontation. That makes escorted ‌tankers more ⁠likely to become targets.

The strategic backdrop is even less forgiving. Attacks on export infrastructure in the United Arab Emirates have shown even backup routes are vulnerable. Saudi Aramco is exploring alternatives through the Red Sea, but that route itself faced threats and harassments from Iran-aligned Houthi militants and has been effectively closed since 2024. In fact, the risk is so high that container shipowners stayed away even after Trump brought the Houthis to a peace deal last May and they have only recently ​stated their intention to return.

If the chokepoint ​stays disrupted, oil prices will rocket ⁠further. A full closure without any offsets could remove roughly 20 million barrels a day from global supply, Goldman Sachs analysts reckon. Apply Goldman’s rule of thumb that every million barrels per day of lost oil supply for a year adds $8 ​to oil prices, based on data since 1998. If the Hormuz disruption lasts three months, that formula suggests crude ​could jump $40 per barrel. ⁠In that scenario, $100 oil would become the new normal.

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Context News

• The U.S. Navy could begin escorting oil tankers through the Strait of Hormuz if necessary, President Donald Trump said on March 3, adding he had ordered the U.S. International Development Finance Corporation (DFC) to provide political risk insurance and financial guarantees for maritime trade in the ⁠Gulf.
• The DFC ​said on March 3 it is ready to mobilize its Political Risk Insurance and Guaranty products ​to stabilize international commerce and support American and allied businesses operating in the Middle East during this period of conflict with the Iranian regime. Brent crude rose 3.3% to $84 a barrel by 0659 GMT ​on March 4, after closing on March 3 at its highest since January 2025.

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Editing by Aimee Donnellan; Production by Shrabani Chakraborty

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Yawen Chen

Thomson Reuters

Yawen focuses on European energy and luxury companies, commodity markets, and real estate as a columnist for Reuters Breakingviews in London. Previously, she was a columnist with Breakingviews in Hong Kong, covering a broad spectrum of topics concerning the Chinese economy, financial markets, and regional companies. She initially joined Reuters News as an economics correspondent in 2016. She earned the title of Reuters’ Journalist of the Year in 2023 in the commentary category.

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