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Asian stocks fall as naval blockade threat injects new turmoil into financial markets.

Oil prices have risen sharply following US President Donald Trump’s announcement of a naval blockade of Iran.

Brent crude, the international benchmark, rose more than 8 percent on Sunday to top $103 a barrel.

It was the first time the benchmark rose above the psychologically important threshold of $100 since Tuesday, when prices surpassed $111 a barrel.

Trump announced on Sunday that the US Navy would block all ships from entering or exiting the Strait of Hormuz, following the collapse of ceasefire talks between US and Iranian officials over the weekend.

US Central Command said in a later statement that it would only block vessels travelling to and from Iran and that other traffic would not be impeded, in an apparent scaling back of Trump’s threat to impose a full blockade.

The command said the blockade would take effect on Monday at 10am Eastern Time (14:00 GMT).

Oil prices have been a rollercoaster since US-Israeli strikes on Iran prompted Tehran to impose a de facto blockade of the Strait of Hormuz, a conduit for about one-fifth of global oil and natural gas supplies.

After topping $119 last month, Brent fell below $92 a barrel last week after the US and Iran announced a two-week ceasefire following more than six weeks of war.

While Iran has allowed a limited number of ships to transit the waterway, subject to prior vetting and authorisation, traffic has been reduced to a trickle compared with peacetime levels.

Despite Washington and Tehran’s fragile truce officially remaining in place until April 22, only 17 vessels crossed the strait on Saturday, according to maritime intelligence firm Windward, down from roughly 130 daily transits before the war.

Major stock markets in Asia opened lower on Monday as Trump’s blockade threat stoked uncertainty on trading floors.

Japan’s benchmark Nikkei 225 fell 0.9 percent in morning trading, while South Korea’s KOSPI dropped more than 1 percent.

US stock futures, which are traded outside of regular market hours, also fell, with those tied to the benchmark S&P 500 down about 0.8 percent.

DEVELOPING STORYDEVELOPING STORY,

Crude prices continue to climb as world faces its biggest energy crisis in decades.

Oil prices have surged to their highest level in nearly two weeks amid escalation on multiple fronts of the US-Israel war on Iran.

Brent crude, the global benchmark, rose more than 3 percent on Monday morning to top $116 a barrel.

The latest climb took the global benchmark to its highest point since March 19, when it briefly touched $119 a barrel.

The surge came after Iran said it was prepared for a US ground invasion, with the speaker of the country’s parliament warning that Tehran was waiting for the arrival of US troops to “set them on fire” and “punish” their regional allies.

Tehran’s warning came as the conflict deepened over the weekend, with the Iranian-backed Houthis launching missiles at Israel for the first time in the war, and Israel expanding its invasion of southern Lebanon.

Iran’s effective closure of the Strait of Hormuz in retaliation for the US-Israel war has disrupted about one-fifth of global oil and liquified natural gas (LNG) supplies, plunging the world into its biggest energy crisis in decades.

Oil prices have risen nearly 60 percent since the start of the war, driving up fuel prices worldwide and forcing numerous countries to adopt emergency measures to conserve energy.

Analysts have warned that oil prices are likely to keep rising unless maritime traffic returns to normal levels in the strait.

Greg Newman, the CEO the Onyx Capital Group, which began as an oil derivatives trading house, said that energy markets were only beginning to feel the fallout of the turmoil.

“Physical oil moves around the world in loading cycles , and Europe has taken around three weeks to really start feeling the effects of the oil shortage,” Newman told Al Jazeera.

“Brent is starting to reflect the reality, and we think it’s a steady rise from here towards $120 and beyond.”

Newman said the scale of the disruption had yet to be fully appreciated.

No one in the market has ever seen the outages we are now suffering from – physical premiums are the highest ever. There is still a sense that the macro world is not taking this seriously enough, but it is worse than anything that has come before it,” he said.

“The reality will come out in the economic numbers over the coming months.”

More to follow…

Published on 18/03/2026 – 16:20 GMT+1•Updated
16:25

Brent crude oil prices reached $110 a barrel on Wednesday afternoon, after Iranian state media reported that part of the South Pars gas field, the largest plant in Iran, and the Asaluyeh oil facility were struck by Israel.

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Moreover, the US oil benchmark WTI also rose and is trading at $98 a barrel at the time of writing.

In response to the latest Israeli attacks, the IRGC announced that some Gulf energy sites are once again “legitimate targets”.

The prospect of escalation and prolongation of the conflict in the Middle East, resulting in further destruction of energy infrastructure, and consequently disruption to global markets, has sent oil prices higher once again.

The climb occurs despite other positive news that would normally have a dampening effect on energy markets.

Saudi Arabia confirmed on Wednesday that its biggest oil refinery, Ras Tanura, restarted operations on 13 March.

Additionally, the Trump administration officially announced a 60-day waiver of the Jones Act, a century-old maritime law that restricts the movement of cargo between US ports to vessels that are American-built, American-owned, American-flagged and crewed.

However, in the face of increased tensions and more attacks on oil infrastructure, these potentially mitigating developments have not had any effect in taming prices.

Trump administration confirms Jones Act waiver

The White House Press Secretary, Karoline Leavitt, confirmed the Trump administration’s decision to issue a 60-day waiver of the Jones Act.

The measure lifts the restriction on the movement of cargo between US ports, allowing foreign tankers temporarily and cheaply to transport vital resources such as oil, gas and fertilisers along the US coastline.

In a post on X on Wednesday, Leavitt explained that the decision is “just another step to mitigate the short-term disruptions to the oil market as the US military continues meeting the objectives of Operation Epic Fury.”

The last Jones Act waiver was issued in October 2022 for a tanker supplying Puerto Rico after Hurricane Fiona.

Before that, the Biden administration temporarily eased the law in 2021 for refiner Valero Energy, after a cyberattack crippled a major East Coast fuel pipeline.

Trump renews pressure on allies to secure the Strait of Hormuz

In a separate development, US President Donald Trump has renewed pressure on allies to join a naval escort mission in order to secure the Strait of Hormuz and normalise the circulation of vessels in the region.

In a post on Truth Social, President Trump argued that allied countries need to use the Strait of Hormuz while the US does not, and warned that they could be left managing it on their own in the aftermath of the war.

Since President Trump’s original request, no firm commitments have emerged, but on Monday, the Wall Street Journal reported that the White House plans to announce as early as this week that multiple countries have agreed to join the escort mission.

The report also stated that officials are still deliberating whether such an operation would start before or after the war ends.

After meeting in Brussels, EU foreign ministers discussed extending the bloc’s Aspides naval mission to the Strait of Hormuz, but ultimately declined to participate.

Energy markets remain on tenterhooks as the prospect of prolonged war in the Middle East grows.

Oil prices have again risen above $100 per barrel as energy markets see little relief amid the biggest disruption to global energy supplies in a generation.

Brent crude, the international benchmark, surged more than 9 percent on Thursday as traders weighed the prospect of weeks, or even months, of turmoil in energy markets as the United States and Israel wage war on Iran.

Brent futures, which are traded outside of regular market hours, were priced at $101.13 as of 03:00 GMT.

Asian stock markets, including exchanges in Tokyo, Seoul and Hong Kong, opened sharply lower on Friday, following steep losses on Wall Street overnight.

The latest surge in oil prices came after Iran’s Supreme Leader Mojtaba Khamenei pledged to maintain the effective closure of the Strait of Hormuz, which normally transports about one-fifth of global oil supplies.

In a statement read out on his behalf on Iranian state television, Khamenei described Tehran’s threats against shipping in the waterway as a “lever” that “must continue to be used”.

US President Donald Trump struck a similarly defiant tone on Thursday, posting on Truth Social that stopping Iran from getting nuclear weapons was of “far greater interest and importance” than rising oil prices.

‘Lack of tangible goals in this war’

Traffic through the strait has effectively ground to a halt due to Iranian threats, with only a handful of vessels passing through each day, many of them claiming links to China, Iran’s key economic partner.

According to the United Kingdom Maritime Trade Operations (UKMTO) centre, no more than five ships have passed through the waterway each day since the US and Israel launched joint strikes on Iran on February 28, compared with an average of 138 daily transits before the war. At least 16 commercial vessels have been attacked in the region since the start of the conflict, according to the UKMTO.

Tehran has claimed responsibility for several of the attacks, including a strike on Wednesday that crippled a Thai-flagged vessel off the coast of Oman.

Efforts to bring calm to the market have so far done little to tame prices, which are up nearly 40 percent compared with before the start of the war.

The International Energy Agency’s (IEA) announcement on Wednesday that member countries would release 400 million barrels of oil from emergency stockpiles drew a tepid response among traders eyeing a daily shortfall in global supplies estimated at 15-20 million barrels.

The US Department of the Treasury’s issuance on Thursday of a temporary licence authorising countries to purchase sanctioned Russian oil that has been stranded at sea also failed to move the market, with Brent crude staying above $100 a barrel after the Treasury announcement.

“The key problem is a lack of tangible goals in this war,” said Adi Imsirovic, an energy security expert at the University of Oxford.

“It makes it hard for oil traders to see the light at the end of the tunnel,” he said.

Trump has repeatedly floated the possibility of using the US Navy to escort commercial shipping through the strait, but the Pentagon has yet to conduct such operations amid concerns about the risks posed by Iranian attacks in the narrow waterway.

In an interview with CNBC on Thursday, US Energy Secretary Chris Wright said that Washington was “not ready” to provide navy escorts but that such operations could begin by the end of the month.

“It’ll happen relatively soon but it can’t happen now,” Wright said.

The global energy landscape is facing its most volatile period in decades following the US-Israeli strikes against Iran on 28 February that triggered a wider and potentially prolonged conflict in the Middle East.

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What began as a targeted military operation has rapidly escalated into a direct confrontation with global economic implications.

Based on claims by Iranian state media and regional reports, the Islamic Revolutionary Guard Corps (IRGC) has ostensibly adopted a strategy of “energy blackmail” to leverage the international community into pressuring the US and Israel to cease its attacks.

The $200 per oil barrel threat was first articulated shortly after the conflict began.

On Sunday 1 March, a senior IRGC spokesperson warned that if “cowardly anti-human actions” continued, the world should prepare for a massive price surge, even as high as $200 per oil barrel.

This rhetoric has since become a central pillar of Tehran’s messaging.

As recently as this Wednesday, Ebrahim Zolfaqari, the spokesperson for Iran’s Khatam al-Anbiya military command headquarters, told state media: “Get ready for the oil barrel to be at $200, because the oil price depends on the regional security which you have destabilised.”

Iran’s tactical disruption

The IRGC’s current strategy relies on “internationalising” the cost of the conflict.

By disrupting the flow of nearly 20% of the world’s oil and liquefied natural gas (LNG) through the Strait of Hormuz, Iran aims to drag the global economy into the fray.

This is why the IRGC has targeted vessels from neutral nations, including ships sailing under Thai, Japanese and Marshall Islands flags, among others.

According to energy analysts, this disruption is designed to create domestic political pressure within Western nations, to in turn force the US and Israel to pull back on military action in exchange for energy stability.

By striking countries that have not attacked them directly, Tehran is signaling that no maritime trade is safe as long as the strikes on its soil continue.

The main vector of this strategy is precisely the disruption of energy markets, an element Iran can influence directly through its geographical advantage.

A history of oil price shocks

While $200 per barrel sounds astronomical, oil has approached similar levels in the past when adjusted for inflation.

The highest nominal price ever recorded was around $147 in 2008, driven by peak oil fears and rampant speculation just before the global financial crisis. When adjusted for 2026 inflation, that 2008 peak represents roughly $211 per barrel.

Previous major shocks, such as the 1973-74 Arab Oil Embargo and the 1979 Iranian Revolution, saw prices quadruple and double respectively from pre-crisis levels.

In 1980, prices hit a nominal peak of about $39.50, which would be approximately $160 in today’s terms.

However, the current crisis involves a total physical blockade of one of the world’s most critical maritime chokepoint, increasing the risk of a price “moonshot”.

Market response and reserves

At the time of writing, Brent crude is trading just above $100 per barrel, a sharp increase from the $60 range seen in mid-February before the Iran war began.

The International Energy Agency has attempted to stabilise the market by orchestrating the largest-ever coordinated release of strategic reserves, but the continuation of Iranian strikes agaisnt oil infrastructure and tankers has largely neutralised the effort.

With insurance providers cancelling war-risk coverage and shipping companies redirecting fleets, the market remains in a state of high anxiety.

If the blockade on the Strait of Hormuz persists, the $200 figure may shift from a political threat to an increasingly likely scenario.

In a recent report, Oxford Economics identified $140 per barrel as the threshold at which the global economy tips into mild recession, reducing world GDP by 0.7% by year-end and pushing the UK, the Eurozone and Japan into contraction.