The headlines say the crisis is winding down. An interim agreement in Switzerland, signed on June 19, promised to reopen the Strait of Hormuz. Everyone wants to believe the global economy can just flick a switch and return to normal. News channels are showing footage of South Korean cargo ships finally exiting the Persian Gulf. Oil prices dipped briefly.
But talk to anyone running a major refining operation in East Asia, and they won't share that optimism. The reality on the ground is messy, expensive, and outright frantic.
If you think a diplomatic breakthrough suddenly fixes the global supply of aviation turbine fuel, you don’t understand how modern oil refining works. The 2026 Iran war didn’t just pause shipping lines; it permanently broke the delicate, just-in-time logistics network that keeps global aviation in the air. Refineries in South Korea—the primary engine of jet fuel production for the Asia-Pacific region and parts of North America—are still running on absolute fumes, burning through strategic reserves, and paying exorbitant premiums for alternative crude.
The crisis isn't over. It's just entering a more complicated phase.
The Illusion of a Quick Reopening
The basic economic assumption is that when a blockade lifts, supply chains instantly snap back. It's a nice theory. It's also completely wrong.
When the war between Iran and the U.S.-Israel coalition effectively choked off the Strait of Hormuz earlier this year, it trapped 20% of the world's oil trade. For South Korea, the shock was structural. The country relies on the Persian Gulf for roughly 70% of its crude oil imports. When those tankers stopped moving, Asian refining giants like SK Energy, GS Caltex, S-Oil, and HD Hyundai Oilbank couldn't just switch vendors overnight.
The interim pact allows commercial vessels to transit the strait without fees for 60 days. But passing through a geography that was recently a war zone isn't a simple voyage. Maritime insurance companies aren't rushing to lower war-risk premiums. Hundreds of ships are backed up, creating a massive logistical traffic jam.
Even as vessels start trickling out of the Gulf, it takes anywhere from three to four weeks for a supertanker to travel from the Middle East to the processing hubs of Ulsan and Yeosu. That means the crude entering the strait today won’t hit a distillation column until late July. Until then, refiners are caught in a desperate cash-burn phase.
Why Jet Fuel Is Harder to Fix Than Crude Oil
The biggest misunderstanding about this energy shock is treating all oil the same. You can’t just throw any crude into a refinery and expect aviation-grade fuel to come out the other side.
Refineries are highly tuned chemical plants designed for specific "diets" of crude oil. Middle Eastern grades like Arab Light or Dubai crude are medium-sour crudes. They possess a specific chemical composition that yields a high percentage of middle distillates—the category that includes diesel and jet fuel.
To cope with the Hormuz shutdown, South Korean refiners had to pivot to alternative sources:
- U.S. Light Sweet Crude: Abundant, but yields far more light ends like naphtha and gasoline rather than the heavy-duty jet fuel airlines need.
- African and North Sea Crudes: Expensive to ship across the globe, cutting deep into refining margins.
- Russian Naphtha and Crude: Acquired via temporary 30-day sanctions waivers and non-dollar payments, a desperate short-term move that carries immense political and regulatory risk.
When a refinery changes its crude slate to a lighter mix, its jet fuel yield drops. You can run the facility at 100% capacity, but you're getting less actual aviation fuel per barrel. This is why the global market for jet fuel remains incredibly tight even as overall crude oil inventories show a slight buffer. The International Energy Agency noted that while global oil demand dropped during the height of the crisis, individual markets for diesel and jet fuel stayed dangerously vulnerable.
The Hidden Math Behind the Scramble
Let’s look at what is happening inside the executive suites of these plants. The numbers reveal the true scale of the anxiety.
South Korea started this crisis with what looked like a decent cushion: a combined government and private sector stock capable of covering about 67 days of domestic consumption. But as part of the coordinated IEA emergency release of 400 million barrels, Seoul had to chip in 22.5 million barrels. That single move gutted the government's solo reserves down to a mere 26 days of coverage.
Emergency bilateral deals, like the 24 million barrels secured from the United Arab Emirates to bypass Hormuz via pipelines to the Red Sea port of Yanbu, offered a temporary lifeline. But those barrels come with massive logistics premiums. Saudi Arabia managed to ramp up its East-West pipeline flows to Yanbu from 2 million barrels a day to over 5 million barrels in June. But piping oil across a desert and loading it onto ships at a completely different port adds layers of cost that refiners have to absorb.
South Korea Petroleum Reserves Status (Days of Consumption)
Initial Combined State & Private Stocks: 67 days
Post-IEA Emergency Release Contribution: 26 days (Government-only)
Emergency UAE Procurement Buffer: +9 days
Refiners are paying unprecedented freight rates and premium prices for spot cargoes just to keep their fluid catalytic crackers running. If a refinery drops below a certain operational threshold, restarting it safely can take weeks. They are paying whatever it takes to stay online, hoping they can pass those costs down the line.
The Pain Spreads to the Skies
Airlines are already paying the price for this refinery scramble. Because South Korea is a dominant exporter of refined products across Oceania and Southeast Asia, the supply crunch immediately rippled into regional airports.
Airlines in Australia, which gets the vast majority of its jet fuel from China, Singapore, and South Korea, are operating on razor-thin margins of safety. Carriers across Southeast Asia are aggressively adding fuel surcharges to tickets or canceling routes entirely. Major operators like Korean Air entered an internal emergency mode months ago, cutting discretionary corporate spending just to offset the soaring price of aviation fuel.
Even with the ceasefire news, the market isn't resetting. Jet fuel prices in Asian hubs remain sticky. Refiners aren't going to lower their wholesale prices until they recover the catastrophic losses they took buying $90+ spot crude during the peak of the Hormuz blockade.
What Happens Next
If you're tracking this crisis, stop looking at the diplomatic photo-ops and start watching the physical infrastructure. The structural damage to the market takes a long time to heal. Qatar’s Ras Laffan Industrial City suffered infrastructure damage during the height of the conflict that analysts estimate will take three to five years to completely repair, permanently altering Asian LNG and condensate pricing dynamics.
The immediate next steps for the energy and aviation sectors require aggressive operational shifts rather than passive waiting:
- Airlines must extend fuel hedging contracts through at least the first quarter of 2027. Relying on spot prices right now, expecting a post-ceasefire crash, is a gamble based on a flawed understanding of refining lag times.
- Refiners will maintain suppressed export volumes of middle distillates. Expect South Korea and Japan to prioritize domestic aviation and military requirements over international spot markets, keeping regional jet fuel supplies tight through the summer peak travel season.
- Supply chain managers need to audit the crude origins of their fuel suppliers. The heavy reliance on temporary sanctions waivers for Russian or alternative blends means regulatory compliance risks remain volatile. One policy shift in Washington or Brussels could instantly invalidate supply agreements.
The geopolitical risk premium isn't going away. This war proved that the world's commercial aviation sector depends entirely on a 21-mile-wide stretch of water in the Middle East and a handful of complex processing plants in East Asia. The tankers are moving again, but the scramble inside the refineries is nowhere near over.
