World absorbed Iran war oil loss, but depleted reserves raise risk

The Iran war created history's largest oil disruption, with peak losses of 14 million barrels per day after the Strait of Hormuz was largely closed, according to Reuters .japantimes+1
A June 17 interim deal reopened the strait and the U.S. Treasury issued a two-month oil sanctions waiver, but talks on a lasting peace have yet to produce a breakthrough.apnews+1
Analysts cut 2026 Brent crude forecasts to $84.50 per barrel on eased supply fears, but warn depleted strategic reserves leave little buffer for any renewed disruption.reuters+1

The world has managed to absorb the loss of more than a billion barrels of oil supply since the Iran war began in late February, but depleted strategic reserves and the absence of a lasting peace agreement are keeping energy markets on edge, according to a Reuters analysis published on Sunday.japantimes+1

A Historic Disruption Met With Historic Response

The four-month conflict between the United States, Israel, and Iran created the largest energy disruption in history, according to the International Energy Agency. At its peak, supply losses reached 14 million barrels per day after Tehran throttled the Strait of Hormuz in response to U.S. and Israeli strikes launched on February 28. The strait, which handles roughly 20 percent of the world's petroleum supply, was largely closed from early March until the signing of an interim Memorandum of Understanding on June 17.reuters+2

The global economy avoided the worst-case scenario through an unprecedented combination of strategic petroleum reserve releases — the IEA coordinated a 400-million-barrel drawdown from its 32 member countries — along with the lifting of restrictions on Russian oil purchases and the utilization of spare pipeline capacity to bypass the Gulf. Analysts have since dialed down their 2026 Brent crude forecasts to an average of $84.50 per barrel, down from $90.44 projected in May, as the Strait's reopening eased immediate supply concerns.reuters+1

Interim Deal Brings Relief, Not Resolution

The June 17 agreement, signed electronically following a meeting between President Donald Trump and French President Emmanuel Macron at the Palace of Versailles, called for the immediate termination of military operations and the reopening of the Strait of Hormuz. The U.S. Treasury Department subsequently issued a two-month license allowing Iran to produce and sell oil without penalties on buyers.apnews+3

But the deal deferred the hardest questions — including Iran's nuclear program, its ballistic missile arsenal, and the future governance of the strait — into a 60-day negotiation window now approaching its midpoint. Talks continued in Doha last week, with Qatar reporting "positive progress," though there was no sign the sides had made headway toward a lasting peace.hklaw+3

Depleted Buffers Leave Markets Vulnerable

With strategic petroleum reserves drawn down to historically low levels and OPEC+ preparing to increase output targets from August, the cushion available for any future disruption has thinned considerably. Oil prices fell to four-month lows last week on optimism over the Doha talks, with Brent settling near $70 per barrel. But analysts warn that until a final agreement is reached, the risk of renewed disruptions to shipping lanes and energy infrastructure remains elevated — and the world now has far less room to absorb another shock.reuters+3

Sources (20)