Iran: Strait of Hormuz Maritime Escalation & Regional Strikes

BLUF

Between 10 and 20 March, the Iran conflict escalated sharply across every domain and crossed a critical new threshold with direct strikes on energy production infrastructure. The US conducted a large-scale precision strike on Kharg Island on 13 March, destroying over 90 military targets while deliberately sparing oil infrastructure. Israel struck Iran’s South Pars gas field at Asaluyeh on 18 March, disabling most of Iran’s gas production and triggering immediate Iranian retaliatory strikes against energy infrastructure in Qatar, Saudi Arabia, the UAE, and Kuwait.

Qatar’s Ras Laffan LNG complex suffered extensive damage. Brent crude briefly touched $119/bbl on 19 March before settling near $109. Commercial transit through the Strait of Hormuz remains down approximately 97% from pre-war levels, though a growing permission-based transit system has seen non-Iranian vessel crossings nearly double in recent days. Israel killed Iranian Intelligence Minister Esmail Khatib on 18 March, adding to the elimination of Ali Larijani, the Basij commander, and multiple IRGC intelligence officials during the reporting period.

The Pentagon requested an additional $200 billion for the war. Israel’s Prime Minister stated the war may end sooner than expected, while the US administration is considering deploying thousands of additional troops to the region.

What We’ve Observed

Strategic Context

As of 10 March, the conflict had entered its second week. Mojtaba Khamenei, confirmed as Supreme Leader on 8 March, issued his first public statement on 12–13 March vowing to keep the Strait of Hormuz closed as a strategic pressure tool. Reuters and Secretary Hegseth confirmed Mojtaba Khamenei had suffered minor wounds in the opening strikes. Iranian Foreign Minister Araghchi continued to publicly rule out ceasefire talks. On 12 March, a KC-135 aerial refueling aircraft crashed in western Iraq, killing all six crew; CENTCOM confirmed the incident was not caused by hostile fire but involved a collision with another US aircraft in friendly airspace.

Strait of Hormuz – Transit Collapse & Permission-Based System (10–20 March)

On 10 March, only two outbound Iranian-flagged vessels were recorded transiting the Strait and no inbound crossings. A bulk carrier reported an explosion 36 nautical miles off Abu Dhabi. US intelligence confirmed Iran had begun mine-laying operations; CENTCOM destroyed 16 Iranian mine-laying vessels on 11 March. Trump claimed a total of over 30 mine-laying ships were destroyed across the period. On 14 March, AIS-confirmed commercial crossings fell to zero. Approximately 400 vessels were tracked holding position in the Gulf of Oman.

By mid-March, Iran’s selective blockade had consolidated into a permission-based transit system. Windward confirmed that vessels calling at Iranian ports or obtaining IRGC clearance were being allowed passage through Iranian territorial waters. On 16 March, a Pakistani-flagged Aframax tanker became the first non-Iranian cargo vessel to transit with AIS active. By 17 March, eight non-Iranian vessels were detected transiting on a single day, nearly double the numbers seen in the preceding days. Traffic remained approximately 97% below normal levels. Since 28 February, only 21 tankers had transited the route, compared with over 100 ships daily before the conflict. The US dropped bunker-buster munitions on hardened Iranian missile sites near the Strait on 18 March, targeting anti-ship cruise missile storage. Insurance markets remain a critical factor: most P&I clubs cancelled war risk extensions effective 2 March, and replacement cover has not been widely restored. India reported 22 vessels still anchored in the Strait awaiting confirmation for safe passage, and was in ongoing negotiations with Iran. By 20 March, UKMTO had recorded over 20 vessel incidents since 28 February.

Major Strike Activity (10–20 March)

On 13 March, the US Air Force conducted a large-scale precision strike on Kharg Island, Iran’s primary oil export hub handling approximately 90% of Iran’s crude exports. CENTCOM stated the strike destroyed over 90 Iranian military targets including naval mine storage facilities, missile storage bunkers, and military infrastructure. Trump stated US forces had deliberately chosen not to strike oil infrastructure. Iran accused the UAE of being the launch point and threatened three UAE ports. Over 13–14 March, IDF conducted strikes on over 200 targets across Iran. The IDF destroyed the main Iranian Space Organization research centre.

On 18 March, Israel struck Iran’s South Pars gas field at Asaluyeh in Bushehr Province, the world’s largest natural gas reserve, in what Israeli officials confirmed was a coordinated operation with the United States. The strike disabled most of Iran’s gas production, taking offline approximately 100 million cubic metres per day of processing capacity (roughly 14% of South Pars output) and halting gas flow from Iran to Iraq. This marked the first direct strike on Iran’s upstream energy infrastructure since the war began, crossing a threshold the US had previously sought to avoid. Iran’s IRGC issued immediate warnings listing five specific energy facilities in Saudi Arabia, the UAE, and Qatar that would be targeted. Within hours, Iran struck Qatar’s Ras Laffan Industrial City, causing extensive damage per QatarEnergy. Ras Laffan processes all of Qatar’s gas from the North Field, which supplies roughly 20% of global LNG. Iran also struck Saudi and UAE energy facilities and Kuwaiti gas units on 19 March.

Israel carried out strikes against Iranian naval targets in the Caspian Sea on 18–19 March, including five missile boats, a headquarters, and a shipyard at Bandar Anzali. This marked the first strikes in the Caspian theatre. Israel also struck Yazd airport and fuel depots. On 19 March, a US F-35 made an emergency landing after a suspected hit by Iranian forces. Iran struck the BAZAN Group oil refinery in Haifa. By 19 March, CENTCOM reported over 7,800 US strikes against targets in Iran, over 8,000 aerial sorties, and more than 120 Iranian vessels destroyed or damaged. The IDF had conducted approximately 5,000 aerial sorties and 7,600 strikes. Trump stated Israel would not attack South Pars again, but threatened to “massively blow up” the entire South Pars field if Iran continued attacks on Qatar.

Key Leadership Eliminations (10–20 March)

On 13 March, the Israeli Air Force eliminated two senior IRGC Khatam al-Anbiya intelligence officials Abdollah Jalali-Nasab and Amir Shariat. On 14 March, Kata’ib Hezbollah Iraq senior figure Abu Ali al-Aamiri was killed in a US strike. On 16 March, Israel killed Gholamreza Soleimani, commander of the IRGC Basij forces. On 17 March, Israel killed Ali Larijani, head of the Supreme National Security Council; his son Morteza Larijani and head of security Vahid Fateminia were also killed in the same strike. On 18 March, Israel confirmed it had killed Iranian Intelligence Minister Esmail Khatib in a strike the previous night. Israeli Defense Minister Katz announced he had authorised the military to kill any senior Iranian official once an opportunity arises, without the need for additional approval. DNI Tulsi Gabbard told senators the Iranian regime “appears to be intact” although “largely degraded.”

Iranian Retaliatory Strikes Across the Region (10–20 March)

Iran sustained a high operational tempo throughout the reporting period. By 19 March, 281 total Iranian attack waves against Israel had been identified, with the Tel Aviv metropolitan area remaining the primary target (39.5% of waves). Iran introduced cluster munitions into its attacks on Israel on 18–19 March, striking residential areas in Ramat Gan (killing two civilians), the Sharon region (killing a Thai agricultural worker), and the occupied West Bank (killing four people including women at a beauty salon near Hebron). A total of 15 civilians have been killed in Israel since the war began, with over 3,600 injured.

Following the South Pars strike, Iran launched retaliatory attacks on energy infrastructure across the Gulf on 18–19 March. Qatar’s Ras Laffan suffered extensive damage. Missiles and drones targeted Saudi refining and petrochemical facilities. UAE gas fields at Jebshan and Bab were hit by intercept debris. A vessel was struck by an unknown projectile off Qatar’s Ras Laffan. Dubai International Airport was struck by a drone on 16 March. Bahrain confirmed its air defences had intercepted 132 missiles and 234 drones since the war began. Kuwait’s security services thwarted a Hezbollah-affiliated cell planning attacks on critical infrastructure, arresting 10 Kuwaiti citizens. Qatar expelled Iran’s military and security attachés, declaring them persona non grata. Saudi Arabia declared that trust in Iran had been “completely shattered” and warned that non-political options were on the table.

Hezbollah maintained sustained offensive pressure on northern Israel. On 14 March, Hezbollah conducted 56 attack waves, the highest single-day total of the campaign. On 18 March, 49 waves were recorded. Israel announced limited ground operations in Lebanon on 16 March. Israel’s Lebanon campaign has killed over 1,000 people and displaced over 1 million. The IDF reported eliminating more than 20 militants in southern Lebanon over 24 hours through 19 March.

Air Defense Deployments & Allied Posture (10–20 March)

The US redeployed all THAAD air defense systems from South Korea to CENTCOM. NATO deployed Patriot systems to southeastern Turkey; three Iranian missiles targeting Turkey had been shot down by 16 March. Greek forces in Saudi Arabia intercepted two Iranian ballistic missiles targeting Aramco-Exxon refineries using Patriot systems on 19 March. The US dispatched a third carrier strike group (USS George H.W. Bush), bringing total US carrier presence to three. The USS Gerald R. Ford was reported heading to Crete for repairs after 268 days deployed. The administration was considering deploying thousands of additional troops to reinforce Middle East operations. NATO allies largely declined Trump’s calls for naval assistance to reopen the Strait.

Bypass Route Degradation & Regional Ports (10–20 March)

Iran struck Oman’s Salalah port with Shahed-136 drones, igniting fuel storage tanks visible on satellite imagery. The Awahi Industrial Area of Sohar, Oman was also hit. Fujairah’s oil terminal suffered a fire forcing partial suspension. Saudi Arabia continued diverting crude via the East-West Pipeline to Yanbu. Combined bypass pipeline capacity covers only 3.5–5.5 million bpd against the normal 20 million bpd Strait flow. Iran executed a rare crude export from the Kooh Mobarak terminal east of the Strait, bypassing the chokepoint entirely, suggesting a deliberate effort to diversify export routes.

Diplomatic & Political Developments (10–20 March)

On 17 March, Joe Kent, Director of the US National Counterterrorism Center, resigned, the first senior official to quit over the war. In his first public interview on 18 March, Kent stated there was no intelligence of an imminent Iranian attack and that Israel had pulled the US into the conflict. DNI Gabbard was accused of altering Senate testimony on Iran, allegedly omitting intelligence details that contradicted Trump’s claims of an imminent threat. The Pentagon requested an additional $200 billion for the war. The US had spent an estimated $16.5 billion in the first 12 days. Trump waived the Jones Act for 60 days to allow foreign-flagged vessels to move fuel domestically. The US also issued a 30-day sanctions waiver on Russian oil already loaded on tankers.

Netanyahu stated on 19 March that Israel was helping the US open the Strait of Hormuz, that Iran had lost the ability to enrich uranium and make ballistic missiles, and that the war may end sooner than expected. The UN warned that 3 million Iranians had been displaced by strikes. Iran executed three men connected to January protests, including a 19-year-old wrestler whose conviction had drawn international criticism. Planet Labs restricted satellite imagery distribution over Iran citing concerns about tactical use by adversarial actors.

Economic Disruption (10–20 March)

The conflict entered a new phase of energy infrastructure escalation. Brent crude briefly touched $119/bbl on 19 March before falling back after Netanyahu’s statements about reopening the Strait, settling near $109. WTI reached $96. Oil prices have risen approximately 80% since the conflict began. The Brent-WTI spread widened to the largest since May 2019. Total oil output cuts in the Middle East are estimated at 7–10 million bpd, representing 7–10% of global demand. Analysts warned Brent could test $150, with $200 not outside the realm of possibility. The IEA’s 400 million barrel reserve release and the US SPR release of 172 million barrels over 120 days have provided limited market relief. European natural gas benchmarks jumped 6% following the South Pars strike. US gasoline prices have risen nearly a dollar since the war began, with California prices exceeding $5/gallon. Asian stock markets fell sharply on 19–20 March. The Federal Reserve held interest rates unchanged.

Why This Matters

The Israeli strike on South Pars on 18 March represents the most significant escalation since the conflict began. It crossed a threshold the US had deliberately maintained – avoiding upstream energy infrastructure – and triggered an immediate energy-for-energy retaliation cycle. Iran’s retaliatory strikes on Ras Laffan, Saudi refineries, UAE gas fields, and Kuwaiti gas units demonstrate that Gulf energy infrastructure is now fully in the targeting matrix on both sides. The damage to Ras Laffan, which processes all of Qatar’s LNG output (roughly 20% of global supply), has the potential to create a structural LNG shortage that persists well beyond the conflict itself.

The permission-based transit system through the Strait continues to consolidate Iran’s de facto sovereignty over international waters. The near-doubling of non-Iranian vessel transits in recent days, concentrated among Chinese, Indian, Pakistani, and Turkish-flagged vessels, suggests Iran is using selective access as a geopolitical tool. The collapse of marine insurance coverage for the region remains a structural barrier to any normalisation of Western-affiliated shipping, even if military conditions improve.

The pace of leadership attrition continues to degrade Iran’s capacity to both fight and negotiate. The killing of Intelligence Minister Khatib, following Larijani, Soleimani (Basij), and multiple IRGC intelligence officials, is systematically dismantling Iran’s command and decision-making architecture. DNI Gabbard’s assessment that the regime remains “intact but largely degraded” aligns with observed operational indicators: Iran’s attack tempo has stabilised at approximately 10–11 waves per day against Israel, down from 44–55 in the opening days, consistent with munitions rationing for a prolonged attrition strategy. Domestically, Kent’s resignation and the allegations of altered intelligence testimony are opening a credibility front that could constrain the administration’s freedom of action.

What’s Next (Assessment)

The energy-for-energy escalation cycle is the most dangerous dynamic in the conflict. Trump’s threat to destroy the entirety of South Pars if Iran continues striking Qatar creates a conditional red line that Iran may test. The distinction between US and Israeli targeting decisions is eroding – the South Pars strike was reportedly coordinated despite Trump’s public claim of no prior knowledge. Further Israeli strikes on Iranian energy infrastructure cannot be ruled out, which would trigger further retaliatory strikes on Gulf facilities. The exposed targets include the remainder of Ras Laffan, Saudi Aramco’s eastern facilities, and UAE refining capacity at Ruwais.

Netanyahu’s statement that the war may end sooner than expected, combined with his claim that Iran has lost the ability to enrich uranium and produce ballistic missiles, may signal the beginning of an off-ramp narrative. However, the operational trajectory does not yet support this: the US is requesting $200 billion in additional funding, considering further troop deployments, and Israel has stated it has thousands of remaining targets. The convergence of the US four-week and Israeli three-week operational timelines around end of March remains the most plausible near-term decision point.