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Tehran, Iran – The United States has reinforced its naval blockade on Iran’s southern ports, amid the escalating military confrontation between them.

The US blockade on Iran was first imposed in mid-April and remained for over nine weeks. It was only lifted after the two sides signed a Memorandum of Understanding (MoU) in June to end four months of fighting and reopen the Strait of Hormuz.

Iran immediately began exporting tens of millions of barrels of crude oil, much of it stored on supertankers anchored close to its oil terminals. However, after the recent resurgence in military strikes over control of the Strait of Hormuz, Washington rescinded oil and banking waivers issued as part of the MoU and prevented vessels linked to Iran from returning to port to load more Iranian oil.

Since the MoU effectively fell apart due to recent strikes, US Central Command (CENTCOM) has redirected several ships operating in the Strait of Hormuz. It also launched a strike to disable the Curacao-flagged supertanker Belma, which had allegedly been transporting Iranian crude during the war.

Iran has also been accused of striking ships in the waterway, leading to the US bombing Iranian coastal areas.

Iranian authorities have acknowledged the previous blockade drastically reduced Iranian crude exports. Iran’s parliament speaker and chief negotiator, Mohammad Bagher Ghalibaf, said in a TV interview at the end of June that “we did not export even one barrel” during the blockade.

Energy analyst Hamidreza Shokouhi told Al Jazeera that the new US siege means that at least 1.5 million barrels per day of Iranian oil exports will be taken off the market. That has contributed to pushing oil prices up to around $90 per barrel and sustained conflict could cause further increases.

“That means more pressure on global strategic reserves, which have already been tapped during the war and are facing unprecedented pressure,” he said.

Washington’s insistence on vessels using the southern route of the Strait of Hormuz close to the coast of Oman for the duration of the MoU has contributed to the current military escalation, the analyst said.

Shokouhi noted that Iran responded to the siege by trying to ensure that no other regional country could export their oil via the strait, piling pressure on the US and its allies.

“When the US acts this way, Iran also moves in the direction of not prioritising the economy and using the leverage at its disposal,” Shokouhi said.

A broadening conflict

Seven nights of tit-for-tat strikes between the US and Iran have quickly escalated and intensified as the week progressed.

The attacks left a trail of destruction in both Iran and countries across the region, with Kuwait and Bahrain heavily targeted by Iranian missiles and drones in recent days.

The US military has also heavily targeted provinces across Iran, particularly areas in the south closer to the strait.

Civilian infrastructure – including bridges and tunnels, ports and dock facilities, power stations and water plants – have been systematically hit, along with military sites. Some have speculated that could be in preparation for a ground invasion of Iranian coastal regions.

The Aq Tekeh railway bridge in the northern Iranian province of Golestan was among the first targets to be struck by US forces last week after the fighting re-erupted.

Iranian authorities said damage to the bridge was quickly repaired, but the strike signalled US willingness to attack potential import-export routes to exacerbate the impact of the naval blockade.

Aq Tekeh is on the Gorgan-Incheh Borun line, which connects Iran to the east, including Turkmenistan, Russia and China. It is where food and other essentials are imported from Central Asia and Iranian goods are exported, such as iron ore and polyethylene.

Rising inflation

The previous US naval blockade had also significantly impacted goods and markets in Iran, making everyday life for over 90 million people more difficult.

Although there were no widespread shortages of staples, Iran’s inflation rate – already one of the world’s highest – surged. The price of some basic foodstuffs, such as eggs, chicken and cooking oil, has more than tripled compared to a year ago.

Price increases have also damaged other sectors of the Iranian economy and industries.

“Our sales are very inconsistent. The market is struggling to find prices, there’s too much instability and uncertainty about the future,” said Borzou, a merchant dealing in industrial motors and equipment at Tehran’s Grand Bazaar.

“It looks like most distributors here are still tapping into imported inventories from before, we don’t know what to expect in a few months since many of these goods came through China and the UAE and not all can be imported through inland routes,” he told Al Jazeera.

Rial hits all-time low

There has also been intense pressure on the Iranian rial from the renewed military escalation and reimposition of the naval blockade.

The rial changed hands for over 1.93 million against the US dollar in Tehran’s open market on Saturday, the first day of the Iranian week, registering a new all-time low.

The Tehran Stock Exchange continued its downward trend over the past week, with its main index losing another 120,000 points or 2.4 percent on Saturday to stand at 4.77 million.

Iran’s armed forces have warned they will retaliate against any US strikes on Iran’s civilian infrastructure by attacking similar targets in regional countries hosting US military bases.

“Let’s not forget that the US and Israel started attacks against infrastructure, when they hit South Pars gas fields, Tehran’s oil depots and the petrochemicals in Mahshahr,” said energy analyst Shokouhi.

Utilising help from the Houthi group in Yemen, Tehran could also cause significant disruptions to shipping in the strategically important Bab al-Mandab strait off Yemen’s coast – if US President Donald Trump realises his threat to hit more civilian infrastructure in Iran such as power plants and bridges.

“Trump’s actions over recent months, and particularly over recent days, have only made the situation more intractable and the outlook more uncertain. The current situation cannot continue for much longer, but it is broadening the scope of the conflict and that is concerning,” Shokouhi said.

U.S. Central Command (CENTCOM) on Wednesday unleashed a new wave of strikes on Iranian targets. The attacks, on Iran’s Greater Tunb Island, came as the newly restored blockade on Iranian ports entered its first full day and the command began ordering ships headed to Iran to turn around. Meanwhile, Iran claims it damaged several U.S. military facilities in new rounds of missile and drone attacks in the region.

“CENTCOM launched precision munitions against coastal defense systems and cruise missile storage and launch sites on Greater Tunb Island during the 90-minute wave,” the command stated on X. “The strikes further degraded Iran’s ability to attack commercial shipping in the Strait of Hormuz.” The island, located at the western mouth of the Strait, sits about 30 miles south of the Iranian coast and about 50 miles northwest of the United Arab Emirates (UAE), which also lays claim to it, along with the Abu Musa and Lesser Tunb islands that Iran seized in 1971.

Greater Tunb Island was a frequent target during Operation Epic Fury. A little more than two miles across at its widest point, it hosts a “vast network of underground bunkers,” created by the Islamic Revolutionary Guard Corps (IRGC), according to the Israeli Alma Research and Education Center think tank. “These underground facilities are believed to be storing anti-ship missiles and other weapons threatening freedom of navigation and commerce through the Strait of Hormuz.”

In a subsequent X post, CENTCOM stated that since “restarting the naval blockade against Iranian ports 17 hours ago, U.S. forces have redirected 2 commercial vessels attempting to run the blockade. The U.S. military remains vigilant and prepared to ensure full compliance.”

In its announcement on Tuesday that the blockade had been reimposed, CENTCOM stated that there are “currently more than 20 U.S. Navy warships and hundreds of military aircraft operating across the Middle East. American forces remain vigilant, lethal, and ready.”

Control over the Strait has been at the center of most of the flare-ups of violence that have taken place after a shaky ceasefire was agreed to by the U.S. and Iran on April 8. They’ve often involved Iranian attacks on commercial shipping in the Strait followed by U.S. kinetic responses. However, these kinetic encounters have been intensifying over the past five days, leading President Donald Trump to order the resumption of the naval blockade on Iranian ports. It went into effect at 11:30 PM local time on Tuesday.

As we have frequently noted, the blockade was lifted on June 17 when the U.S. and Iran signed a 14-point Memorandum of Understanding (MoU). The MoU provided a 60-day extension of the ceasefire to iron out an agreement to end fighting throughout the region, including Lebanon, prevent Iran from seeking nuclear weapons, end U.S. sanctions and resume the flow of traffic through the Strait of Hormuz, among other points.

Iran, as we noted earlier in this story, said it carried out a number of retaliatory strikes on Kuwait, Bahrain and Jordan as it has over the past five days. All three nations host an array of U.S. military facilities.

The Iranian Army’s public relations office said it “launched a seventh wave of drone strikes on U.S. bases in the region on Wednesday, targeting F-18 facilities and support infrastructure at al-Azraq in Jordan,” Iran’s official Mehr news outlet stated on Wednesday. The strikes “were part of ‘Operation Thunderbolt’ and followed six earlier waves of drone attacks on U.S. positions since the American violation of the ceasefire and the start of ‘brutal attacks’ on Iranian territory.”

TWZ cannot independently confirm Iran’s claims and CENTCOM declined comment.

“Jordan’s military intercepted three Iranian missiles,” The New York Times reported, citing a statement carried by the official Petra news agency. “The Kuwait Army said earlier that its air defenses were intercepting hostile targets, while Bahrain’s interior ministry said warning sirens had been activated. None of the countries have reported damage or casualties from strikes on Wednesday.”

However, images and videos have emerged online purporting to show damage at several installations in the wake of Iranian attacks over the past several days.

The following post on X uses satellite imagery from Iranian state media to claim damage to an anti-drone radar system at Prince Hassan Air Base in Jordan; however, its low resolution makes it hard to confirm that claim.