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Analysis: What happens if Iran closes the Strait of Hormuz?

Analysis Analysis: What happens if Iran closes the Strait of Hormuz?
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Strait of Hormuz, Makran region in southern Iran and southwestern Pakistan, Gulf of Oman and the northern coast of Oman as seen from space. (Photo by NASA Earth Observatory/ AFP)
Analysis Analysis: What happens if Iran closes the Strait of Hormuz?
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The Strait of Hormuz is one of the most strategically vital chokepoints in the world, and any blockade by Iran would pose serious risks for transport of oil. (AFP/File)
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Updated 17 June 2025

Analysis: What happens if Iran closes the Strait of Hormuz?

Analysis: What happens if Iran closes the Strait of Hormuz?
  • Tehran has never fully closed the strategic waterway but it has threatened to do so many times in response to geopolitical tensions
  • Iran-Israel war has potentially immediate ramifications for energy-exporting Gulf states and, in the longer term, for the entire world

LONDON: It is thanks to a quirk of ancient geological history that almost half the global oil and gas reserves are located under or around the waters of the Arabian Gulf, and that the flow of the bulk of bounty to the world must pass through the narrow maritime bottleneck that is the Strait of Hormuz.

On Friday, Israeli Prime Minister Benjamin Netanyahu told the world that Israel’s unprecedented attack on Iran earlier in the day was an act of self-defense, aimed at disrupting its nuclear program.

By Saturday, Israel had broadened its targets from nuclear facilities, ballistic-missile factories and military commanders to oil facilities in apparent retaliation for waves of missile and drone strikes on its population centers.




This handout satellite image released by Planet Labs on June 15, 2025, shows close up view of damaged tunnel entrances at Kermanshah missile facilities, western Iran on June 15, 2025. (© 2025 PLANET LABS PBC via AFP)

In his video broadcast, Netanyahu said: “We will hit every site and every target of the ayatollahs’ regime, and what they have felt so far is nothing compared with what they will be handed in the coming days.”

In a stroke, Israel had escalated the conflict into a crisis with potentially immediate ramifications for all the oil- and gas-producing Gulf states and, in the longer term, for economies of the region and the entire world.

Reports originating from lawmakers in Tehran began to circulate suggesting that Iran was now threatening to close the Strait of Hormuz. Sardar Esmail Kowsari, a member of Iran’s parliament and a commander in the Islamic Revolutionary Guard Corps, warned in an interview that closing the waterway “is under consideration and that Iran will make the best decision with determination.”

While the strait is, in the words of the US Energy Information Administration, “the world’s most important oil transit choke point” — about a fifth of the world’s total petroleum liquids consumption passes through it — the two main oil producers, the UAE and Ƶ, are not without alternative routes to world markets for their products.




This handout natural-color image acquired with MODIS on NASA's Terra satellite taken on February 5, 2025 shows the Gulf of Oman and the Makran region (C) in southern Iran and southwestern Pakistan, and the Strait of Hormuz (L) and the northern coast of Oman (bottom). (Photo by NASA Earth Observatory / AFP)

Saudi Aramco operates twin oil and liquid gas pipelines which can carry up to 7 million barrels a day from Abqaiq on the Gulf to Yanbu on the Red Sea coast. Aramco has consistently shown resilience and ability to meet the demands of its clients, even when it was attacked in 2019.

The UAE’s onshore oil fields are linked to the port of Fujairah on the Gulf of Oman — beyond the Strait of Hormuz — by a pipeline capable of carrying 1.5 million barrels a day. The pipeline has attracted Iran’s attentions before. In 2019, four oil tankers, two each belonging to Ƶ and the UAE, were attacked off the port of Fujairah.

Iran has never fully closed the Strait of Hormuz but it has threatened to do so multiple times in response to geopolitical tensions.

Historically, it has used the threat of closure as a strategic bargaining tool, particularly during periods of heightened conflict. In 2012, for instance, it threatened to block the strait in retaliation for US and European sanctions but did not follow through.




This US Navy handout screenshot of a video shows fast-attack craft from Iran’s Islamic Revolutionary Guard Corps Navy swarming Panama-flagged oil tanker Niovi as it transits the Strait of Hormuz on May 3, 2023. (AFP/File)

Naturally, disruptions in supplies would cause an enormous increase in energy price and related costs such as insurance and shipping. This would indirectly impact inflation and prices worldwide from the US to Japan.

According to the experts, Iran can employ unmanned drones, such as the Shahed series, to target specific shipping routes or infrastructure in the strait. It may also attempt to use naval vessels to physically obstruct passage through the strait.

Ironically, the one country in the region that would face no direct consequences from a blockade of the Strait of Hormuz is Israel. All of its estimated consumption of 220,000 barrels of crude a day comes via the Mediterranean, from countries including Azerbaijan (exported via the Baku–Tbilisi–Ceyhan pipeline, which runs through Turkiye to the eastern Mediterranean), the US, Brazil, Gabon and Nigeria.

Opinion

This section contains relevant reference points, placed in (Opinion field)

The capability to disrupt traffic in the Strait of Hormuz is one thing, a full closure is quite another, as it would harm Iran’s own economy given that it relies on the waterway for its oil exports.

History teaches that shutting off the flow of oil from the Arabian Gulf is far easier said than achieved. The first country to attempt to prevent oil exports from the Gulf was Britain, which in 1951 blockaded exports from the Abadan refinery at the head of the Gulf in response to the Iranian government’s decision to nationalize the country’s oil industry.

The motive was purely financial. In 1933 Britain, in the shape of the Anglo-Iranian Oil Co., a forerunner of today’s BP, had won a lopsided oil concession from the Iranian government and was reluctant to give it up.

The blockade did not last — impoverished post-war Britain needed Abadan’s oil as badly as Iran — but the consequences of Britain’s actions are arguably still being felt today.

The very existence of the current Iranian regime is a consequence of the 1953 coup jointly engineered by Britain and the US, which overthrew then Prime Minister Mohammad Mossadegh, architect of the oil nationalization plan, and set Iran on the path to the Islamic Revolution of 1979.

The first modern blockade of oil shipments in the Gulf happened the following year, when Saddam Hussein, hoping to take advantage of the disruption caused by the revolution and the ousting of the shah, attacked Iran, triggering the disastrous eight-year Iran-Iraq War.

Still equipped with the shah’s US-supplied and trained air force and navy, Iran’s first reaction was successfully to blockade Iraqi warships and oil tankers in Umm Qasr, Iraq’s only deep-water seaport.




Picture released on November 17, 1980 of a column of smoke billowing from an Iranian helicopter shot by Iraqi anti-aircraft fire, near Abadan, during Iran-Iraq war. (AFP/File)

Iraqi aircraft began attacking Iranian shipping in the Gulf, provoking an Iranian response that focused initially on neutral ships bringing supplies to Iraq via Kuwait, a development that soon escalated into attacks by both sides on shipping of all flags.

The first tanker to be hit was a Turkish ship bombed by Iraqi aircraft on May 30, 1982, while loading at Iran’s Kharg Island oil terminal. The first to be declared a total loss was a Greek tanker, struck by an Iraqi Exocet missile on Dec. 18, 1982.

In terms of lives lost and ships damaged or destroyed, the so-called Tanker War was an extremely costly episode, which caused a temporary sharp rise in oil prices. By the time it ended in 1987, more than 450 ships from 15 countries had been attacked, two-thirds of them by Iraq, and 400 crew members of many nationalities had been killed.

Among the dead were 37 American sailors. On May 17, 1987, American frigate the USS Stark, patrolling in the Gulf midway between Qatar and the Iranian coast, was hit by two Exocet missiles fired by an Iraqi Mirage jet.




A port quarter view of the guided missile frigate USS STARK listing to port after being struck by an Iraqi-launched Exocet missile on May 17, 1987. (Wimimedia Commons: Pharaoh Hound)

But at no point throughout the Tanker War was the flow of oil out through the Strait of Hormuz seriously disrupted.

“Iran couldn’t fully close the strait even in the 1980s,” said Sir John Jenkins, former UK ambassador to Ƶ and Iraq.

“It’s true that in those days the UK and others had a significant mine-sweeping capacity, which we lack today. But even if Iran laid mines again or interfered with shipping in the strait in other ways it will almost certainly draw in US maritime forces from the 5th Fleet (based in Bahrain) and perhaps air assets too.




US Navy warships are seen transiting the Strait of Hormuz, during a deployment to the US 5th Fleet area of operations. (AFP/File)

“Also, attempting to close Hormuz will hit their own significant illegal oil trade.”

Regardless, the Iranians “will be very tempted to do this. But it is a delicate calculation — doing enough to get Russia and in particular China involved in support of de-escalation but not enough to provoke US action, effectively on the side of Israel,” Jenkins said.

In an analysis published in February last year, following an uptick in maritime aggression by Iran in and around the Strait of Hormuz, the Center for Security Policy, a Washington think tank, concluded that because 76 percent of the crude oil that passes through it is destined for Asian markets, “as one of Tehran’s sole remaining allies, it would not be in China’s best interest for the strait to fully close.”




Oil tankers pass through the Strait of Hormuz. (REUTERS/File Photo)

Lessons learned during the 1980s Tanker War are relevant today. In the wake of that conflict, an analysis by the Strauss Center for International Security and Law offered a cool-headed assessment of the vulnerability of the Strait of Hormuz to any attempt at enforced closure by Iran.

“Our research and analysis reveals significant limits to Iran’s ability to materially reduce the flow of oil through the Strait of Hormuz for a sustained period of time,” the report, published in 2008, said.

“We find that a large-scale Iranian campaign would yield about a 5 percent chance of stopping each tanker’s transit with small boat suicide attacks and a roughly 12 percent chance of stopping each tanker’s transit with volleys of anti-ship cruise missiles.”

Initially, the Tanker War led to a 25 percent drop in commercial shipping and a temporary sharp rise in insurance premiums and the price of crude oil.




Tally of attacks on oil tankers during the so-called Tanker War of the 1980s. (Wikimedia Commons)

“But the Tanker War did not significantly disrupt oil shipments … Even at its most intense point, it failed to disrupt more than 2 percent of ships passing through the Gulf,” the report said.

The bottom line, it said, “is that if a disruption to oil flows were to occur, the world oil market retains built in mechanisms to assuage initial effects. And since the long-term disruption of the strait, according to our campaign analysis, is highly improbable, assuaging initial effects might be all we need.

“Panic, therefore, is unnecessary.”

Israel’s critics say it already has much to answer for in unleashing its unilateral assault on Iran. Netanyahu has been claiming for years that Iran was “only months away” from producing a nuclear weapon and his claim that that is the case now has no more credibility than before.

“Benjamin Netanyahu has started a war with Iran that has no justification,” said Justin Logan, director of defense and foreign policy at Washington think tank the Cato Institute.




Israeli Prime Minister Benjamin Netanyahu’s true motives in launching his attack on Iran at this time are not hard for political observers to divine. (Pool Photo via AP, File)

Friday’s opening attacks overtook US President Donald Trump’s statement earlier that same day that “the United States is committed to a diplomatic resolution to the Iran nuclear issue.”

“Iran was not on the precipice of acquiring nuclear weapons,” Logan said. “It had not thrown out IAEA inspectors, from whom all information about the Iran nuclear program flowed. It had not enriched uranium to weapons-grade.”

Netanyahu’s true motives in launching his attack at this time are not hard for political observers to divine.

He has successfully derailed US-Iranian nuclear talks — ongoing negotiations, due to have been continued on Sunday in Oman, were canceled.

The attack has also caused the postponement of the three-day joint Saudi-French Gaza peace summit at the UN, which had been due to begin on Tuesday, with the issue of Palestinian sovereignty high on the agenda — anathema to Netanyahu’s right-wing, anti-two-state government.

“Israel has the right to choose its own foreign policy,” Logan said.

But “at the same time, it has the responsibility to bear the costs of that policy.”


Hamas says Israel making ‘aggressive’ incursions into Gaza City

Hamas says Israel making ‘aggressive’ incursions into Gaza City
Updated 4 min 3 sec ago

Hamas says Israel making ‘aggressive’ incursions into Gaza City

Hamas says Israel making ‘aggressive’ incursions into Gaza City
  • The Israeli military said Wednesday it had approved the “framework” for a new offensive in the Gaza Strip
  • The Netanyahu government’s plans to expand the Gaza war after more than 22 months of fighting have sparked an international outcry as well as domestic opposition

JERUSALEM: A Hamas official said Wednesday that Israeli forces were making “aggressive” incursions into Gaza City, after the military approved the framework for a new offensive in the territory.
“The Israeli occupation forces continue to carry out aggressive incursions in Gaza City,” Ismail Al-Thawabta, director general of the Hamas government media office in Gaza, told AFP. “These assaults represent a dangerous escalation aimed at imposing a new reality on the ground by force, through a scorched earth policy and the complete destruction of civilian property.”

The assualt follows the Israeli military's announcement on Wednesday that it had approved the “framework” for a new offensive in the Gaza Strip, days after the security cabinet called for the seizure of Gaza City.
Armed forces chief Lt. Gen. Eyal Zamir “approved the main framework for the IDF’s operational plan in the Gaza Strip,” a statement released by the army said.
Prime Minister Benjamin Netanyahu’s government has not provided a precise timetable for when Israeli troops will enter the territory’s largest city, where thousands have taken refuge after fleeing previous offensives.
Gaza’s civil defense agency said Israeli air strikes on Gaza City have intensified in recent days, with the residential neighborhoods of Zeitoun and Sabra hit “with very heavy air strikes targeting civilian homes, possibly including high-rise buildings.”
News of the military’s approval of the plan comes hours after Hamas said a senior delegation had arrived in Cairo for “preliminary talks” with Egyptian officials on a temporary truce.
The Netanyahu government’s plans to expand the Gaza war after more than 22 months of fighting have sparked an international outcry as well as domestic opposition.
“These assaults represent a dangerous escalation aimed at imposing a new reality on the ground by force, through a scorched earth policy and the complete destruction of civilian property.”
UN-backed experts have warned of widespread famine unfolding in the territory, where Israel has drastically curtailed the amount of humanitarian aid it allows in.
Israel’s offensive has killed at least 61,599 Palestinians, according to figures from the health ministry in Gaza which the United Nations considers reliable.


Iran security chief vows continued ‘support’ for Lebanon

Iran security chief vows continued ‘support’ for Lebanon
Updated 29 min 18 sec ago

Iran security chief vows continued ‘support’ for Lebanon

Iran security chief vows continued ‘support’ for Lebanon
  • Ali Larijani’s trip to Lebanon comes after Iran expressed opposition to a government plan to disarm Hezbollah
  • Larijani met President Joseph Aoun and Prime Minister Nawaf Salam, as well as parliament speaker Nabih Berri

BEIRUT: Iran’s top security chief vowed in Lebanon on Wednesday that his government would continue to provide support, after the Lebanese government ordered the army to devise a plan to disarm Tehran-backed militant group Hezbollah.
Ali Larijani’s trip to Lebanon comes after Iran expressed opposition to a government plan to disarm Hezbollah, which before a war with Israel last year was believed to be better armed than the Lebanese military.
“If... the Lebanese people are suffering, we in Iran will also feel this pain and we will stand by the dear people of Lebanon in all circumstances,” Larijani, the head of the National Security Council, told reporters after landing in Beirut.
Dozens of Hezbollah supporters gathered along the airport road to welcome Larijani. He briefly stepped out of his car to greet them as they chanted slogans of support.
In Lebanon, Larijani met with President Joseph Aoun and Prime Minister Nawaf Salam, as well as parliament speaker Nabih Berri, who is close to Hezbollah.
Iran has suffered a series of blows in its long-running rivalry with Israel, including during 12 days of open war between the two countries in June.
Hezbollah’s grip on power has slipped since a war with Israel ended in a November 2024 ceasefire and the new Lebanese government, backed by the United States, has moved to further restrain it.
Hezbollah is part of Iran’s so-called “axis of resistance” — a network of armed groups in the region, including Hamas in Gaza and Yemen’s Houthi rebels, united in their opposition to Israel.
The ouster in December of Bashar Assad in Syria, which long served as a conduit for weapons deliveries between Iran and Hezbollah, cut off the supply route to Lebanon.


Syrian FM says government to hold perpetrators of violations in Sweida accountable

Syrian FM says government to hold perpetrators of violations in Sweida accountable
Updated 37 min 40 sec ago

Syrian FM says government to hold perpetrators of violations in Sweida accountable

Syrian FM says government to hold perpetrators of violations in Sweida accountable

DUBAI: Syrian Foreign Minister Asaad Al Shaibani said Wednesday the country is committed to holding accountable those responsible for any violations in Druze-majority region of Sweida. 

Speaking from Ankara, Al Shaibani was accompanied by Syrian Defense Minister Marhaf Abu Qasra and intelligence chief Hussein Salameh. 

Shaibani reiterated Damascus’s sentiments in assuring the Druze community that they are part of Syria and their protection is the responsibility of the state. 

Al Shaibani also rejected the notion of exploitation of the Druze community by Israel and other agents. 

Speaking at the joint press conference with his Syrian counterpart, Turkish Foreign Minister Hakan Fidan also blamed Israel for its attempts to meddle in Syrian affairs.

 ”Israel is working to stir chaos in Syria,” Fidan added

Fidan also said Syria is heading toward stability and developing constructive international relations. 

Al-Shaibani’s trip to Ankara is focused on enhancing cooperation between the two countries, enhancing security and developing economic investments. 

It comes a week after Fidan visited Damascus where he affirmed Turkiye’s support for Syria and called on the international community to shoulder responsibility in curbing Israeli aggression and occupation of Syrian lands.


Jordan authorities seize half a million Captagon pills in smuggling attempt

Jordan authorities seize half a million Captagon pills in smuggling attempt
Updated 13 August 2025

Jordan authorities seize half a million Captagon pills in smuggling attempt

Jordan authorities seize half a million Captagon pills in smuggling attempt

CAIRO: Jordanian Customs and the anti-narcotics department foiled an attempt to smuggle a total of 517,000 Captagon pills into the country, according to Petra News Agency. 

The Karameh Customs Center said Wednesday the seized drugs were professionally hidden inside metal trays that seemed to be designed specifically for the purpose of smuggling. 

The drugs were carried inside a truck arriving from a neighboring country, it added.     

At dawn, the Jordanian military also thwarted another drug smuggling attempt in which smugglers loaded balloons with drugs and controlled them using primitive devices. The seized items were transferred to the competent authorities.


Iraq defends border security pact with Iran despite US opposition

Iraq defends border security pact with Iran despite US opposition
Updated 13 August 2025

Iraq defends border security pact with Iran despite US opposition

Iraq defends border security pact with Iran despite US opposition
  • The remarks come in the wake of a new security pact signed between Iraq and Iran in Baghdad
  • While deepening ties with Tehran, the Iraqi government is also under intensifying US pressure

WASHINGTON: The Iraqi Embassy in Washington reiterated on Wednesday Baghdad’s right to independently conclude agreements with any party asserting the country’s full sovereignty despite US criticism. 
The embassy said Iraq “has the right to enter into agreements in accordance with its constitution and national laws, in a manner consistent with its supreme interests,”according to Iraqi News Agency (INA).  
It emphasized that Iraq’s decisions are rooted in its “independent national will” and that the country “is not subordinate to the policies of any other state.”
The remarks come in the wake of a new security pact signed between Iraq and Iran in Baghdad earlier this week, aimed at tightening coordination along their shared border.
However, US State Department spokesperson Tammy Bruce commented on the memorandum, saying: “We support genuine Iraqi sovereignty, not legislation that would turn Iraq into a client state of Iran.”
The agreement, reached during the visit of Iranian top security official Ali Larijani, builds on a March 2023 deal to enhance security in Iraq’s Kurdish region, which Tehran accuses of harboring armed opposition groups.
Prime Minister Mohammed Shia Al-Sudani, who oversaw the signing, framed the pact as part of broader cooperation to secure both countries’ frontiers and promote regional stability. 
Iraqi officials say the measures are intended to curb cross-border infiltration by Iranian Kurdish groups accused by Tehran of fomenting unrest.
The timing of the agreement underscores the complex balancing act facing Baghdad. While deepening ties with Tehran, the Iraqi government is also under intensifying US pressure to rein in pro-Iran militias.