Brent crude broke through $100 a barrel on Thursday for the first time since May, driven there by a new front in a war that keeps finding fresh ways to frighten the oil market. The trigger was the Red Sea, not the Gulf.
The rally did not hold. By Friday Brent had slipped back to about $96.69, down 4.1% on the day, while WTI fell 3.7% to $88.92. Even so, the message landed. Traders will pay triple digits the moment a second chokepoint looks unsafe.
The Houthis open a second door
Yemen's Houthis, an Iranian ally, declared a blanket embargo on Saudi shipping and warned that any tanker calling at a Saudi port would cross the Bab al-Mandab strait at its own risk. The group then backed the threat with force, claiming missile and drone strikes on two Saudi oil tankers that left fires burning on the water. Spokesman Yahya Sarea called it "an eye for an eye."
Ship owners got the message fast. The Chinese supertanker Xin Long Yang turned around mid-route and sailed back the way it came.
Why the Red Sea is the whole point
This is where the war's geography turns cruel for Riyadh. With the Strait of Hormuz choked by fighting, Saudi Arabia had been pushing crude the other way, west across the country by pipeline to the Yanbu terminal on the Red Sea coast. Shipments out of Yanbu through Bab al-Mandab had jumped to roughly 3.5 million barrels a day in June, up from almost nothing a year earlier.
That was the escape hatch. Now the Houthis are firing on it. Saudi Arabia suddenly has both of its main export doors under threat at once, and there is no third one.
An escalation nobody has capped
President Trump said Washington would treat any Houthi strike on Red Sea shipping as Tehran's doing, and told reporters he was weighing a major attack on Iran. Some analysts have begun to float Brent's 2022 high near $128 as the next target if the fighting keeps spreading.
The refined side of the market is tighter still, with war damage to refineries already lifting diesel and jet fuel faster than crude. A prolonged blockade of the Red Sea would stack a second supply shock on top of the first.
What to watch
Friday's pullback shows the market is not convinced the Red Sea is shut for good, only that it might be. The next move rides on whether the Houthis can keep tankers away from Bab al-Mandab, and on how Washington answers. Until then, $100 is not a ceiling. It is a level the market has already touched and could reach again on a single headline.