What If the Strait Stays Closed? : What a prolonged Hormuz closure means for the humanitarian system

The blast radius of this war will not be measured in kilometres. It will be measured in currencies, commodities, and the quiet compression of lives that were already at the margin.

We are seven days into Operation Epic Fury. Iran's Supreme Leader is dead. The Assembly of Experts, the constitutional body meant to choose a successor, was physically disrupted when Israel struck its building in Qom on March 3 while members were reportedly convening. A temporary leadership council is in place, but the permanent succession process is in disarray. The US president is demanding unconditional surrender from a regime whose decision-making authority is fragmented and unclear. Israel is expanding its target set. Iran is striking back across the Gulf.

Nobody knows how this war ends. We all hope for a ceasefire tomorrow. But hope is not a planning assumption, and I've tracked enough crises to know the structural conditions for a rapid one aren't present. You need someone in a room with the authority to agree to terms. On the Iranian side, there is no such person. On the American side, the stated objective is unconditional surrender, a demand for capitulation, not a negotiating position. These are not the conditions under which wars end quickly.

So this piece asks a simpler, more operational question: what happens to the rest of the world if the Strait of Hormuz remains functionally closed for weeks or months?

The strait is already closed. Around 20% of the world's seaborne oil and a fifth of global LNG are offline. Traffic has dropped to near zero. But here is the part most analysis is missing: it is not the Iranian navy keeping the strait shut. CENTCOM has confirmed the destruction of more than 30 Iranian naval vessels. Iran's conventional fleet has been functionally annihilated. And the strait is still closed. Because the force that actually closes a waterway is not military. It is financial. War-risk insurance has been cancelled or repriced so sharply that no commercial ship can legally sail, no port will accept an uninsured vessel, and no bank will finance the cargo. The US Navy cannot reopen what London underwriters won't insure.

This piece argues, based on the precedents of the Houthi Red Sea campaign and Ukraine's Black Sea corridor, that this is not the worst case. It is the most likely case. And it traces what a prolonged closure means, not for the combatants, but for the humanitarian system, the global economy, and the hundreds of millions of people who were already at the margin before a single missile hit the strait.

The chain looks like this:

Hormuz closure → energy shock → global recession pressure → currency depreciation in import-dependent countries → food and fertiliser inflation → humanitarian demand surge → and all of it landing on a system where aid budgets were already cut by 50-67% in the worst-affected countries last year.

All figures current as of March 7, 2026. Oil prices, displacement figures, and military developments are moving targets.

Why the Strait Won't Reopen
The assumption in most Western analysis is that the United States will reopen the Strait of Hormuz. President Trump has said the US Navy would begin escorting tankers through the strait if necessary.

Two recent precedents suggest this assumption is wrong.

Yemen first. The Houthi campaign against Red Sea shipping, launched in late 2023, showed that a non-state militia operating from one of the world's poorest countries could severely disrupt one of the world's most important trade routes using cheap drones and anti-ship missiles. The US, UK, and allied navies conducted extensive strikes, deployed carrier strike groups, established a maritime security coalition. And the result? Major shipping lines rerouted around the Cape of Good Hope. Insurance costs spiked. Normal commercial confidence was never fully restored, even after the Houthis paused attacks following the October 2025 Gaza ceasefire. Sustained Western naval action failed to guarantee the safe passage that commercial shipping requires.

Then Ukraine. Ukraine has no navy to speak of. Russia controls the Black Sea's major surface combatant fleet. And yet Ukraine has effectively secured its own maritime corridor through naval drones, land-based anti-ship missiles, and creative asymmetric tactics. Russia, with all its naval power, has been unable to shut it down.

The lesson from both: a weaker power with cheap, distributed, land-based capabilities can deny a waterway to a stronger power. And a stronger power with total conventional naval dominance cannot guarantee safe passage when the threat comes from shore, not from ships.

Now apply that to the Strait of Hormuz. It's narrower than the Red Sea, around 21 miles at its narrowest, with shipping lanes compressed into a tight S-curve. Iran's coastline runs the entire northern edge. And here's the part most commentators are getting wrong: Iran's naval doctrine was never built around its conventional fleet surviving a US attack. It was built around what happens after the fleet is gone.

As analysts at the Washington Institute and the Center for Naval Analyses have documented, Iran learned from its catastrophic losses against the US Navy in April 1988 that large surface vessels are sitting ducks. So for 35 years, Iran built what they call a "denial navy": shore-based anti-ship cruise missiles with ranges of 120 to 300 kilometres, deployed in fixed and mobile launchers along the entire coast and on islands throughout the strait. Underground drone launch sites. Thousands of naval mines. Fast attack craft small enough to blend in with fishing vessels. All of it dispersed, concealed, and designed to function without a functioning navy above it.

Iran didn't need its frigates to close the strait. It needed its coastline. And the coastline is still there.

Let's be honest about what it would actually take for shipping to resume at scale. One of two things. Either Iran credibly commits to not attacking commercial vessels, which requires a ceasefire and a political settlement that has no mechanism to happen quickly. Or the land-based coastal defence infrastructure needs to be destroyed so thoroughly that Iran is physically unable to strike. And both Yemen and Ukraine have demonstrated that air power alone cannot achieve that against dispersed, concealed, shore-based systems. You'd need a ground component. The US is not going to invade Iran's coastline to reopen a shipping lane. Which means the strait stays closed until there's a political solution, not a military one.

The insurance market already knows this. Protection and indemnity coverage was pulled effective March 5. As one analyst told NPR, it's "really an insurance-driven shutdown." The JMIC confirmed on March 6 that only two commercial transits occurred in the previous 24 hours, both cargo ships rather than tankers. Some vessels are broadcasting "CHINA OWNER" or "MUSLIM-OWNED AND TURKISH-OPERATED" via their transponders as they attempt to transit. That tells you everything you need to know about how well naval escorts are working.

The planning assumption should be that the Strait of Hormuz remains functionally closed for weeks at minimum, potentially months. Everything that follows is built on that assumption.

The Energy Shock Is Already Here
Around 20% of the world's seaborne oil and roughly a fifth of global LNG transits the Strait of Hormuz on a normal day. As I write this, that traffic is at or near zero.

Qatar shut down LNG production at Ras Laffan, the world's largest LNG export facility, after Iranian drone strikes hit facilities at Ras Laffan Industrial City and Mesaieed Industrial City on March 2. Qatar's Defence Ministry confirmed two drones launched from Iran. No casualties were reported from the strikes themselves, but QatarEnergy declared force majeure on all deliveries. Qatar's energy minister, Saad al-Kaabi, said the plant won't operate until the war is over, and warned the Financial Times that oil prices could reach $150 per barrel within weeks if tankers can't pass through the strait.

The market response was immediate and brutal. Dutch TTF gas futures, Europe's benchmark, surged around 46% in a single session, the largest move since the 2022 energy crisis. UK natural gas spiked about 50%. Asian spot LNG prices jumped nearly 39%. Brent crude has pushed past $90 a barrel as of Friday and is climbing.

Iraq, a major oil producer whose exports depend on Hormuz transit, is running out of storage capacity for oil it can't ship. Saudi Arabia's Ras Tanura refinery was also hit by an Iranian drone and temporarily closed.

The immediate question is where the remaining global supply goes. And the answer is: to the highest bidder.

Japan sources around 95% of its crude oil imports from the Middle East. South Korea and Taiwan are similarly dependent. Japanese refiners have already asked their government to release stockpiled oil. These are wealthy, credit-worthy buyers who will outbid poorer importers for scarce alternative cargoes, US LNG exports, Australian shipments, whatever spot volumes can be redirected.

This repricing cascades. When Asian buyers compete for non-Gulf supply, prices rise everywhere. European gas prices climb further, not because Europe imports heavily from the Gulf directly, but because the global LNG market is interconnected and Europe is now competing with Asia for every available cargo. European gas was already elevated heading into spring, with storage levels a concern. A sustained Hormuz closure through the European refill season, the summer months when countries build reserves for winter, would create a genuine energy security crisis.

The Funding Picture Was Already a Disaster
And here's where it connects to the funding picture I've been tracking for months. The cuts we warned about aren't projections anymore. They happened. OECD preliminary data showed ODA fell around 7% in real terms in 2024, the first drop after five years of growth. Humanitarian aid dropped an estimated 9.6%. The OECD then projected another 9 to 17% fall in 2025, and the data from our humanitarian funding dashboard at data.marketimpact.org, drawing on UN OCHA FTS flows, tells the story of what that actually looked like on the ground.

Total humanitarian funding in 2025 was $26.9 billion for 305 million people in need, according to UN OCHA Financial Tracking Service data aggregated on our dashboard. That's $88 per person. And when you look at the year-on-year changes for the countries that matter most, the numbers are staggering. Yemen: down 67%. DRC: down 53%. Somalia: down 51%. South Sudan: down 48%. Ethiopia: down 47%. Nigeria: down 45%. Sudan: down 26%. Afghanistan: down 32%.

Do the math. Yemen received $988 million for 19.5 million people in need. That's $51 per person for the year. Ethiopia got $885 million for 21.4 million people. Forty-one dollars per person. The DRC, $752 million for 21.2 million people in need. Thirty-five dollars per person. For the entire year.

The US, which used to fund more than a third of global humanitarian aid, dropped to $3.5 billion in 2025. The European Commission's humanitarian arm is now the single largest donor at $3.8 billion. For the first time in nearly 30 years, France, Germany, the UK, and the United States all cut their ODA in the same year in 2024, and then they did it again in 2025.

Here's the detail that should make every person reading this pause. The Gulf states, Qatar, the UAE, and Saudi Arabia, collectively provided $4.7 billion in humanitarian funding in 2025. That funding base is now itself under threat from the very war that's generating new need. When Qatar's LNG production is offline and Dubai's port has been struck, the fiscal basis for Gulf humanitarian generosity is directly compromised.

Another energy shock intensifies the domestic-first fiscal pressure in every donor capital. When European governments face higher energy costs, their budget deficits widen. When deficits widen, the political space for foreign aid contracts further. "We can't fund overseas aid when our own energy bills are this high" is an argument that writes itself, and it will be made in every parliament in Europe.

The same donors who already gutted their aid budgets in 2024 and 2025, the structural dismantlement I traced in my previous analyses, now have an additional domestic political reason to cut what little remains.

How the Global Economy Transmits the Pain
Energy prices don't affect only energy consumers. They affect everything.

When oil pushes toward $100 or more per barrel and gas prices are at multi-year highs, the global economy slows. Transport costs rise across every supply chain. Manufacturing input costs increase. Central banks face pressure to raise interest rates to contain inflation, tightening credit and reducing investment. Consumer confidence falls. Spending contracts.

The word for this is recession. And the countries most vulnerable to a global recession are those in the Global South whose economies depend on demand from the Global North.

I think about Bangladesh. Its garment sector depends on orders from European and American retailers. When consumer spending in Europe contracts, driven by higher energy bills and economic uncertainty, those orders slow. Bangladesh's primary source of foreign exchange weakens at precisely the moment its import costs are rising. The balance of payments deteriorates from both sides.

This pattern replicates across every export-dependent developing economy. Agricultural exporters face lower commodity demand. Manufacturing exporters face order cancellations. Tourism-dependent economies see bookings collapse as global uncertainty rises and aviation is shattered.

The second-order effect on humanitarian need is staggering. Economic contraction in the Global South means more people falling into poverty, more pressure on already strained social protection systems, more demand for humanitarian assistance, at precisely the moment when the system has less money, higher costs, and broken supply chains.

This is the compounding dynamic that makes this crisis different from a localised conflict. It's not generating humanitarian need in one place. It's generating it everywhere, simultaneously, through economic transmission channels that the humanitarian system was never designed to monitor or respond to.

The Logistics Collapse
Here's a dimension of this crisis that has received almost no coverage, and it's one I believe will cost lives: the disruption to aviation, shipping, and what both mean for humanitarian surge capacity.

Since February 28, according to Flightradar24, more than 21,000 flights have been cancelled at seven major airports including Dubai, Doha, and Abu Dhabi. Qatar Airways Cargo remains fully suspended. Aviation data firm Rotate reported global air cargo capacity fell 18% in the days after the strikes, with data from Aevean confirming that capacity on the Asia-Middle East-Europe corridor, the one that matters most for humanitarian logistics, dropped by roughly 40%.

Even I underestimated how fast this would cascade. One consultant I spoke to called it "the biggest shutdown since COVID."

If there were an Asian Tsunami-scale natural disaster right now, the global humanitarian community's ability to surge staff and supplies would be drastically impaired. The flights that move surge teams from Nairobi to Jakarta, from Geneva to Dhaka, from London to Colombo, many of those route through Gulf hubs. Those routes are now broken or unreliable. According to Air Cargo News, around 20% of global jet fuel flows through the Strait of Hormuz, and the premium for near-term jet fuel deliveries doubled over the first weekend of the war.

The aviation disruption is only half the story. On February 28, the Houthis announced they would resume attacks on Red Sea shipping. As of early March, active attacks hadn't yet resumed, with reports of internal debate within the group. But the threat alone was enough. Major shipping lines, which had cautiously returned to the Suez route in January, immediately re-suspended Red Sea transits. Maersk, which reported a $153 million loss in its Ocean division for Q4 2025 according to its latest earnings, pulled the plug again.

Let that sink in. The two main maritime routes connecting Asia to Europe and the Middle East are now simultaneously closed or threatened. The only alternative is the Cape of Good Hope, adding two to three weeks to transit times and burning more fuel at a moment when fuel costs are spiking. According to Foreign Policy, around 3,000 ships of all types are stranded, including roughly 10% of the global container ship fleet. Freight analytics firm Xeneta counts 147 container ships sheltering in the Persian Gulf alone.

Now here's the part that should terrify every humanitarian logistician reading this.

The humanitarian supply chain for the Middle East, East Africa, and South Asia was built around Dubai. The International Humanitarian City hosts prepositioned stockpiles for the WHO, IFRC, UNICEF, WFP, and dozens of NGOs. That architecture has been severely disrupted.

The WHO's Director-General confirmed on March 5 that the Dubai emergency logistics hub, which fulfilled more than 500 emergency orders for 75 countries last year, is on hold due to insecurity, airspace closures, and restrictions on Strait of Hormuz access. The WHO's Regional Director for the Eastern Mediterranean, Hanan Balkhy, put specific numbers to it: $18 million in humanitarian health supplies are inaccessible. Another $8 million in shipments can't reach the hub. More than 50 emergency supply requests from 25 countries are affected. Six million dollars in medicines destined for Gaza are stuck. And $1.6 million in polio laboratory supplies are being held up, with direct implications for Afghanistan and Pakistan, the last two countries where the disease is endemic.

WFP, the world's largest shipper of humanitarian food, is pivoting to overland corridors. But WFP's budget was already stretched past breaking before February 28. The math is simple. Same money, higher costs, fewer rations.

And the prepositioned stocks in Dubai weren't just serving current crises. They were the rapid deployment reserve for future emergencies, the next earthquake, the next flood, the next cholera outbreak. That reserve is now depleted, inaccessible, or both. Restocking, even after the strait reopens, will take months. The humanitarian system hasn't just lost supply lines. It's lost the architecture of rapid response.

Currencies, Food, and the People at the Bottom
The energy shock doesn't stay in the energy sector. It transmits into every economy that imports oil and gas through a chain that is predictable, documented, and devastating for the poorest.

I've watched this chain play out in real time. I watched it in Yemen, where exchange rate movements destroyed the value of cash assistance as I was programming it. I watched it after Russia invaded Ukraine in 2022, when the fertiliser price spike rippled through East Africa six months later. The mechanism is the same every time.

Higher energy import costs widen trade deficits. Wider deficits put pressure on currencies. Falling currencies make all imports more expensive, not just fuel, but food, medicine, construction materials, spare parts. For households already spending 50 to 70% of income on food, a 15 to 20% currency depreciation is the difference between eating and not eating.

The countries where this hits hardest share common characteristics: heavy energy import dependence, limited foreign exchange reserves, existing fiscal pressure, and large populations near the poverty line.

Bangladesh, which imports a substantial share of its LNG from Qatar and the UAE and faces simultaneous pressure on garment export earnings. Egypt, one of the world's largest wheat importers, already through multiple devaluations, now watching both energy costs and Suez Canal revenue deteriorate. Lebanon, which even before this week was in economic collapse, and where more than 300,000 people have been displaced as of March 6 according to the Norwegian Refugee Council, with over 100,000 in collective shelters and tens of thousands more crossing into Syria. Sudan, wheat-importing, its currency in freefall, humanitarian operations already triaged to breaking point. Yemen, where I watched exchange rates destroy the value of cash assistance in real time, and which now faces the threat of resumed Red Sea attacks constraining whatever commercial imports remained. Afghanistan, no fiscal buffer, no international financial access, border areas disrupted by hostilities and $1.6 million in polio supplies stuck in a warehouse in Dubai.

The transmission extends to food production. Natural gas is the primary feedstock for nitrogen fertiliser through the Haber-Bosch process. When gas prices spike 45 to 50%, fertiliser prices follow within weeks. When fertiliser prices spike, farmers across South Asia and East Africa use less. When they use less, yields fall. When yields fall, food prices rise, six to eight months from now, during or after the South Asian kharif planting season and the East African long rains. By the time it appears in hunger statistics, the window to act will have closed.

We watched this exact chain play out after Russia's invasion of Ukraine. The conditions this time are worse, because the system that responded then has since been gutted. In 2025, humanitarian funding to Ethiopia fell 47%. Somalia fell 51%. These are the countries that absorbed the last fertiliser shock. They will absorb this one with half the resources.

And then there are the governments. Every country I've described faces the same impossible dynamic: the fiscal pressure from higher energy costs reduces their capacity to subsidise food, fund health services, maintain social protection, and accommodate refugees, at exactly the moment their populations need more support, not less. Prices rise, currencies fall, government capacity contracts, and the people at the bottom find every safety net fraying simultaneously.

The Safety Net Nobody Talks About
There's one more consequence that I believe is the most significant and the least discussed. It's the one I haven't seen on a single humanitarian risk matrix. And it should be on all of them.

Gulf states employ millions of workers from across South Asia, Southeast Asia, and East Africa. A large share of South Asian migrants work in GCC countries. These workers send money home. Remittances globally dwarf humanitarian aid, the World Bank estimated flows to low and middle-income countries at $685 billion in 2024. Gulf labour markets are a major pillar of household resilience across the Global South.

When Gulf economies are disrupted, when construction halts, tourism collapses, ports close, businesses retrench, migrant workers lose hours, lose jobs, or are displaced. The images of missiles hitting Dubai's skyline have already shattered the Gulf's reputation as a safe, stable employment destination. The UAE has confirmed three civilians killed in Iranian strikes, all foreign nationals from Pakistan, Nepal, and Bangladesh, alongside dozens of injuries among workers of more than a dozen nationalities. If that reputation is durably damaged, the effect on labour migration patterns could reshape economic flows that entire countries depend on.

A sustained Gulf economic shock reducing remittance flows would have a larger impact on vulnerable populations than most humanitarian funding cuts. During COVID-19, temporary Gulf disruptions caused remittance dips with measurable, immediate welfare impacts in receiving countries. This crisis has damaged physical infrastructure in ways COVID did not. The Burj Al Arab caught fire from Iranian drone debris. Jebel Ali Port had a fire from interception fallout. Dubai International Airport was struck and partially evacuated. An AWS data centre was hit. This isn't a pandemic pause. This is physical destruction of the economic infrastructure that employs millions of migrant workers.

Remittances are the invisible social protection system, the transfer that arrives without a programme, without a registration database, without a donor. When they stop, there's no fallback. No agency replaces them. Families simply become poorer. And some of them cross the line from coping to not coping, in a world where every other safety net is simultaneously failing.

What Should Be Happening Right Now
We don't know if the strait will be closed for weeks or months. White House press secretary Karoline Leavitt told Fox News on Friday that the war is expected to last four to six more weeks. Axios reported that Secretary of State Rubio told Arab foreign ministers to expect several more weeks of military operations. We do know the consequences of assuming it won't be prolonged, and being wrong, are far worse than the consequences of planning for it and being pleasantly surprised.

Model your economic exposure. Every humanitarian operation in the affected regions should be running scenario analysis today. What does $100 oil mean for your logistics costs? What does a 15% currency move mean for your programme costs? What does a 30% food price increase mean for the people you serve? If you don't have these numbers by Monday, you're already behind.

Diversify logistics now. If your supply chain runs through the Gulf, you need alternatives today. Not next week. The WHO is already exploring Nairobi, Brindisi, and Dakar as alternative hubs. WFP is pivoting to overland corridors. The organisations that will respond fastest when corridors reopen are the ones staging alternatives now.

Engage host governments before they retreat. Fiscal pressure will tempt governments to cut services, restrict imports, and reduce humanitarian cooperation. I've seen this before, in country after country. Have those conversations now, before the budget axe falls.

Monitor remittance corridors. This one is urgent. If Gulf worker employment starts declining, the impact on household welfare will arrive faster than any programme can respond. If you're running cash programming in South Asia or East Africa, you need to be tracking this weekly.

Tell donors the truth, and make it specific. If you're submitting a budget revision right now, cost it at $100 oil and a 15% currency depreciation in your operating context. Don't submit a budget based on last month's prices. Yemen was already getting $51 per person in need for the whole of 2025. Ethiopia was at $41. The DRC was at $35. Those numbers are about to buy even less. If you can't tell a donor exactly how much less, you're not asking for more money. You're just complaining.

And watch the countries that aren't in the headlines. As I write this, the people in Bangladesh, Egypt, Jordan, Lebanon, Ethiopia, and Somalia are about to get poorer. Their food is about to cost more. Their governments are about to have less capacity to help. And the international system that was supposed to backstop them saw its funding cut by 47% in Ethiopia, 51% in Somalia, and 67% in Yemen last year alone, before a single missile hit the Strait of Hormuz.

One more thing. If a ceasefire comes next week and the strait reopens, much of the acute crisis I've described will ease. I hope it does. But the structural vulnerabilities this crisis has exposed, the single-point logistics dependence on Dubai, the insurance-driven chokepoints, the remittance fragility, the fact that the entire humanitarian system was one drone strike away from losing its rapid response architecture, those don't disappear with a ceasefire. They stay. And next time, we might not be this lucky.

What I Want to Hear From You
I'm tracking this in real time, but I'm one person with one vantage point. I need yours.

If you're running operations in any of the affected countries, what's your logistics picture right now? Are alternative corridors actually functioning or are they theoretical? What are you seeing on procurement costs this week versus two weeks ago? WhatsApp me, email me, share in the comments. The sector needs real-time ground truth, not official situation reports from three days ago.
Who is tracking remittance disruption? I've seen almost nothing from the major humanitarian analytics providers on this. If you have data on Gulf employment trends, worker displacement, or remittance flow changes since February 28, please share it. This is the biggest gap in the current analysis.
For those of you in donor capitals, what's the political temperature on aid budgets right now? Is the energy price spike already being used to justify further cuts, or is there any countervailing pressure toward emergency supplementary funding? I want to know what's happening in the corridors, not what's in the press releases.
Cash and voucher assistance practitioners, what's breaking? If currencies are moving this fast and supply chains are this disrupted, I want to know what's actually happening to your transfer values and market baskets this week. I'm working on a deep dive into the CVA implications and I want it grounded in what you're seeing, not what I'm modelling from London.

Share what you're seeing. Tag colleagues who should be part of this conversation. Bear witness to what's happening in your context.

This analysis builds on my previous pieces "The Fine Print: What Came After the $2 Billion Headline" and "The Hyperprioritized Humanitarian System - When Saving Lives Today Means Sacrificing Tomorrow." A forthcoming piece will examine the implications for humanitarian cash and voucher assistance programming, digital payment infrastructure, and financial system resilience. The data dashboard tracking humanitarian funding flows is at data.marketimpact.org.

Thomas Byrnes is CEO of MarketImpact Digital Solutions, a humanitarian consulting firm specialising in digital systems, programme strategy, and responsible AI adoption. He has 15+ years of field experience across 20+ countries, including managing cash programming in Yemen during the exchange rate crisis and scaling IFRC's 30 million euro cash programme in Greece.

This post is from Tom's Aid&Dev Dispatches, a weekly newsletter on humanitarian and development trends.

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