The U.S. Maritime Administration has advised commercial ship captains to navigate “as far as possible” from Iranian waters when transiting the Strait of Hormuz, following a series of escalating boarding attempts by Iran’s Islamic Revolutionary Guard Corps. The advisory, issued Monday, marks a significant escalation in Washington’s maritime security posture amid heightened U.S.–Iran tensions.
What’s Happening
According to the Department of Transportation agency, Iranian forces have carried out multiple boarding attempts on commercial vessels as recently as February 3, employing IRGC speed boats, helicopters, and small-boat tactics to force ships into Iranian territorial waters. The pattern represents a troubling escalation in Iran’s maritime aggression in one of the world’s most critical shipping lanes.
The advisory specifically warns U.S.-flagged vessels that Iranian forces may attempt to compel commercial ships to divert into Iranian waters, where they face the risk of detention or seizure. The incidents come just days after indirect U.S.–Iran talks in Oman on Friday — the first diplomatic engagement since American bombers struck three Iranian nuclear sites during a 12-day war last June.
Global Implications
The Strait of Hormuz is the world’s most important oil chokepoint. Roughly 13 million barrels per day of crude oil — nearly a third of global seaborne crude flows — transited the waterway in 2025, according to Kpler data. Any disruption to passage through the strait would send shockwaves through global energy markets, spike insurance premiums for tanker operators, and threaten crew safety across the commercial shipping industry.
The escalation adds a volatile maritime dimension to already fraught U.S.–Iran relations. Israeli Prime Minister Benjamin Netanyahu is set to meet President Trump in Washington on Wednesday to discuss the Iran nuclear file, with Israel pushing for full dismantlement of Tehran’s nuclear program and an end to its support for regional militant groups.
Guidance for Crews
The Maritime Administration’s advisory instructs ship captains to decline any Iranian request to board U.S.-flagged vessels. If Iranian forces board despite refusal, crews are advised not to forcibly resist — though the agency emphasized that non-resistance does not imply consent. Eastbound vessels should navigate as close to the Omani side of the strait as possible to maximize distance from Iranian waters.
Why It Matters
The Strait of Hormuz is the world’s most consequential shipping lane, and sustained Iranian aggression there threatens the stability of global energy supplies. With diplomatic talks in their earliest stages and military tensions still elevated from last year’s strikes, the maritime corridor remains under extraordinary pressure. By the numbers: 20% of the world’s oil passes through the Strait of Hormuz daily.
