The Strait of Hormuz is once again at the center of global energy anxiety. Iran’s tightening grip on the waterway has pushed Brent crude toward $79, and a new analysis from the International Institute for Strategic Studies warns that the situation could keep prices elevated for the foreseeable future.
What to know
- Iran has asserted operational control over the Strait of Hormuz, a narrow channel through which roughly one-fifth of the world’s oil supply passes.
- Brent crude oil futures have surged toward $79 a barrel after former President Trump ended a ceasefire arrangement with Tehran.
- Iran has formally accused the United States of violating a maritime traffic agreement governing the Strait.
- A report from the International Institute for Strategic Studies (IISS), a Washington-based think tank, concludes that sustained higher oil prices are a likely outcome of the escalating tensions.
- The risk of direct military confrontation has increased, with potential consequences for global oil supply chains and regional stability.
- Analysts warn that prolonged disruption could spill over into the broader economy, raising costs for consumers and businesses worldwide.
The Ceasefire Collapse
The current crisis did not emerge overnight. It began with a US airstrike on an evacuated Iranian dock, which set the stage for a cycle of retaliation. Tanker attacks followed, rattling shipping insurance and prompting a flight to safe-haven assets. The decision by former President Trump to terminate the ceasefire removed the last diplomatic buffer, leaving both sides facing off without a formal channel for de-escalation.
For Iran, the end of the ceasefire was a signal that Washington was returning to a policy of maximum pressure. For the US, it meant that Tehran was now free to escalate in the Strait without fear of violating a truce. The result is a standoff that carries the constant threat of miscalculation.
"The ceasefire was the only thing preventing daily incidents from turning into a broader conflict. Its collapse has fundamentally changed the risk profile of the region."
The Strait Accusation
In the days following the ceasefire's end, Iran leveled a formal accusation: the US had violated the Strait of Hormuz Traffic Agreement, a set of rules intended to prevent collisions and misunderstandings in the waterway. While the specifics of the violation remain unclear, the accusation itself is significant. It provides Tehran with a legal and rhetorical justification for stepping up its presence.
Iran has since asserted control over the Strait, effectively acting as the gatekeeper for oil tankers and cargo ships. The Strait of Hormuz is only about 33 kilometers wide at its narrowest point, making it highly susceptible to disruption from either side of the chokepoint.
Market Reaction: Brent at $79
Oil traders wasted no time repricing risk. Brent crude, the global benchmark, surged toward $79 a barrel — a level not seen since the start of the year. The move reflects not just the physical threat to supply, but the uncertainty around how far Iran is willing to go.
The IISS report notes that the $79 figure is a psychological threshold. If it holds, analysts will begin pricing in the possibility of sustained above-$80 oil, which would have immediate knock-on effects for inflation expectations and central bank policy.
The IISS Assessment
The International Institute for Strategic Studies published its analysis on July 8, 2026, drawing on intelligence and economic modeling. The headline finding: rising geopolitical tensions in the Middle East could lead to sustainably higher oil prices, not just a temporary spike. The report highlights vulnerabilities in global oil supply chains, particularly the reliance on the Strait of Hormuz as a transit route for over 20 million barrels per day.
"What we are seeing is not a repeat of past crises — it is a structural shift. Iran’s ability to control this chokepoint has grown, and the willingness to use that leverage has increased."
The IISS warns that even without a full blockade, the constant threat of disruption will keep a risk premium baked into oil prices. That premium has already pushed Brent to $79, and could drive it even higher if diplomatic efforts fail.
Regional Stability at Risk
The broader Middle East is already under strain. The combination of a US military presence, Iranian assertiveness, and fractured diplomatic relations creates a powder keg. Events that might have been isolated incidents in the past now carry the risk of cascading effects.
Israel has already felt the impact: tanker attacks in the region sent Israeli stocks falling and the dollar rising. The US and Iran are now locked in a cycle of accusation, with each side claiming the other has violated international norms. Without a mediator, the chances of a peaceful resolution diminish by the day.
Global Economic Repercussions
Higher oil prices are never a localized problem. They act as a tax on global growth, reducing disposable income for consumers in importing nations and raising input costs for businesses. Emerging economies that rely on imported energy — such as India, many African nations, and parts of Southeast Asia — are particularly exposed.
The IISS report flags this vulnerability, noting that sustained higher prices could destabilize economies that are already fragile. In developed economies, the risk is inflationary. Central banks that have just begun to ease rates may be forced to pause or reverse course if oil prices remain elevated.
Looking Ahead
The next few weeks will be critical. Will the US and Iran find a way back to negotiations, or will events on the ground force a military confrontation? The IISS report suggests that the window for diplomacy is narrowing but not yet closed.
For markets, every tanker movement and every diplomatic signal will be scrutinized. Brent at $79 is a warning light, not a final destination. The Strait of Hormuz remains the single most dangerous chokepoint for global oil supply, and Iran holds the key.
One thing is certain: the era of cheap and secure oil supplies is over for now. The Middle East has once again reminded the world of its ability to disrupt, and the bill for that disruption is visible in every barrel of Brent.
