Oil Whipsaws Back Above $90 as U.S.-Iran Strikes Resume After Brief Lull

Crude oil jumped nearly 8% on July 29 after the United States and Iran resumed military strikes, ending a pause in hostilities that had held since the previous weekend. September-delivery Brent futures on the ICE exchange settled in the $90-a-barrel range — a violent reversal from just one session earlier, when West Texas Intermediate had slipped to $79 on hopes that Washington’s halt in air strikes would open the door to renewed talks.

From a three-day slide to an 8% spike in one session

The swing captures how completely the oil market is now trading on the war’s day-to-day rhythm rather than on supply and demand fundamentals. Through July 28, prices had fallen for three consecutive sessions as the American pause in strikes on Iran held and optimism about a diplomatic channel grew, dragging WTI down to $79 a barrel. That trade unwound within hours once the fighting restarted: Brent spiked sharply intraday on July 29 and held most of the gain into the close, finishing the session up close to 8%.

The message for anyone pricing energy exposure is uncomfortable. A market that can give back three days of declines in a single session is not converging on a view of where supply will land — it is repricing headline risk in real time, with the pause-and-resume pattern of the strikes themselves acting as the trigger.

Why the Brent print carries so much weight

The $90 close matters well beyond London trading screens because roughly four-fifths of crude traded worldwide is priced off the Brent benchmark. When Brent moves 8% in a day, that repricing propagates into term contracts, refinery margins, and fuel costs across most of the importing world.

The benchmark itself has quietly changed underneath that role. Brent originally referred to light, low-sulfur crude from the North Sea field of the same name, first produced in 1976. Output from that field had effectively fallen to nothing by 2021, forcing the addition of other fields’ crude to the assessed blend — and since 2023 the basket has even included oil drilled in the Midland area of Texas’s Permian Basin. The futures contract, launched on London’s International Petroleum Exchange in 1988 and traded electronically on ICE since 2005, covers 1,000 barrels per lot. In other words, “Brent at $90” today is a composite Atlantic-basin price, which is precisely why a Middle East supply scare shows up in it so quickly and so broadly.

What history says about how far dislocations can run

Extreme moves in oil benchmarks are rare, but when they come they can be far larger than an 8% session. On April 20, 2020, the expiring May WTI contract settled at negative $37.63 a barrel while Brent finished that day at $26.21 — a gap of $63.84 between the world’s two flagship crude prices. That episode was a demand collapse compounded by storage logistics, the mirror image of today’s supply-driven fear. But it stands as a reminder that once a benchmark starts trading on stress rather than fundamentals, the bounds of “normal” pricing can break down quickly.

The present risk runs in the opposite direction: a conflict that repeatedly stops and restarts keeps a persistent premium in the price, because each lull invites positioning for de-escalation that then has to be unwound at a loss — exactly the pattern of the past week.

The bill lands on energy importers first

For economies that import nearly all of their crude, Korea among them, the difference between the $79 WTI print of July 28 and a $90-plus Brent close a day later is not an abstraction. Sustained prices at these levels feed directly into fuel and utility costs, widen the energy import bill, and complicate the inflation picture for central banks that had been leaning toward easier policy. None of that is locked in — a durable ceasefire could take the premium out as fast as it appeared. What the July 29 session established is the size of the move the market is prepared to make, in either direction, on a single day’s news from the conflict.