What are the immediate and long-term implications of the U.S. strikes on Iran for maritime security and global oil shipp

Immediate Implications

The U.S. strikes and the Iranian response that followed caused an abrupt, severe crisis for ships and oil flows through the Strait of Hormuz. The most urgent effects were:

• Direct attacks on commercial vessels – Two UAE tankers were hit by Iranian missiles, killing one crew member [1]. The IRGC struck and disabled two supertankers [5], a tanker was set ablaze by a projectile [22], and the IRGC fired at least two missiles at other merchant ships [23]. U.S. Central Command also reported that Iran launched attack drones toward civilian mariners [91]. These actions made transiting the strait extremely dangerous overnight.

• Effective closure of the Strait – Iran formally declared the waterway closed to all shipping until U.S. interference ended [17][24]. Traffic collapsed from over 120 vessels per day to as few as two tankers [25], and ship transits came to a near halt [42]. By May 2026, traffic was running at only 5% of pre‑war levels, with more than 1,550 commercial vessels and 22,500 mariners stranded [64]. Around 2,000 ships were stuck in the Gulf [47][57].

• U.S. strikes to degrade Iranian capabilities – The American military launched fresh strikes on Iranian targets immediately after ships were attacked [8][11]. U.S. forces hit more than 300 military sites, including key naval bases at Bushehr, Chah Bahar, Jask, Konarak, and Bandar Abbas [7][18]. The stated goal was to “degrade Iran’s ability to attack innocent civilians and commercial shipping” [3].

• Naval blockade and retaliation – On 13 April the U.S. imposed a naval blockade on Iran, intercepting vessels going to or from Iranian ports [32][71][78]. By 18 April, 23 vessels had already been intercepted [37]. The blockade triggered direct military encounters, including the seizure of an Iranian‑flagged vessel and Iranian drone strikes on U.S. warships [75][76]. Iran retaliated by shutting the Strait, turning a blockade into a full‑blown chokepoint crisis [72].

• Immediate economic shock – Oil prices spiked sharply: Brent crude jumped 9–13% in the first days and broke above $90, with warnings of $100 if disruptions continued [4][43][66]. U.S. gasoline prices rose about 70 cents above the prior year [21]. War‑risk insurance premiums soared from roughly 0.25% of a ship’s hull value to as much as 5%, and standard P&I cover was cancelled, making the strait commercially unnavigable [48][69].

• Diplomatic backlash – The attacks complicated negotiations to end the war [12]. Qatar said Iran was fully responsible for an “unacceptable attack” on global energy security [15], and the UAE denounced the use of the Strait as “piracy” that threatened stability and energy markets [2]. Iran demanded control over shipping routes and the right to charge transit fees [13], while the U.S. made safe passage a precondition for further talks [20].

Long‑Term Implications

Even after the immediate explosions stopped, the conflict is reshaping maritime security and oil logistics in ways that will last months or years:

• Prolonged disruption of traffic – DHL’s regional CEO forecast it would take 4–6 months for shipping to normalise [65], and the Pentagon said clearing the mines Iran laid could take six months [49]. Insurers warn that a high risk will persist even after reopening, and that premiums will stay elevated until there is a durable ceasefire, freedom‑of‑navigation guarantees, and verifiable mine‑clearance [48][50][52].

• Global economic ripple effects – The Strait normally handles about 20% of the world’s oil and LNG [31][35][46]. Its drawn‑out closure is expected to keep energy, fertiliser, and transport costs high, pushing up food prices and cost‑of‑living pressures, especially for developing countries with already strained budgets [44][45].

• Insufficient alternative routes – Existing bypass pipelines in Saudi Arabia (East‑West) and the UAE (ADCOP) lack the capacity to replace Hormuz‑shipped volumes [104]. The UAE’s Fujairah terminal, a key bypass, has itself been hit by Iranian drones [95][105]. Iran’s Goreh‑Jask pipeline remains non‑operational [97][103], Iraq’s northern pipeline has only limited capacity [96], and other ideas like a Basra–Oman pipeline or a canal are purely conceptual [98][99]. The global economy remains heavily dependent on the Strait [108].

• A permanently altered security environment – Iran has “weaponised” Hormuz as a bargaining chip [30], and the U.S. administration has signaled an ambition to “ultimately control” the waterway [6]. Ships that try to exit must quietly coordinate with the U.S. Navy, but there is no formal escort and decisions rest with individual operators [82][83][84][85][86]. Vessels face a double bind: transiting without Iran’s approval risks attack, while cooperating with Iran risks U.S. sanctions [89]. Naval escorts are not seen as a sustainable long‑term solution [60], and new threats such as cyberattacks, drone strikes, and sabotage of undersea cables have emerged [59][92].

• Wider regional instability – In coordination with the U.S.‑Israeli strikes, Houthi forces resumed attacks on Red Sea shipping, effectively closing both the Hormuz and Suez corridors at the same time [68]. Iran has also threatened to close the Bab al‑Mandeb [39][74]. These developments are forcing a rethink of global shipping routes, with experts calling for a “networked, multi‑corridor architecture” that avoids relying on any single chokepoint [107].

• Diplomatic deadlock – Iran’s insistence on controlling navigation and charging fees collides with U.S. and Gulf red lines [13][20]. Even short‑term cease‑fires have failed to restore confidence because of vague terms and unrecovered mines [28]. Without a fundamental political settlement, the Strait is likely to remain a contested zone for years.