In an aerial view, the Strategic Petroleum Reserve storage at the Bryan Mound site is seen on October 19, 2022 in Freeport, Texas.

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The International Energy Agency on Wednesday agreed to release 400 million barrels of oil to address the supply disruption triggered by the Iran war, the largest such action in the organization’s history.

The IEA did not set out a timeline for when the stocks would hit the market. It said that the reserves would be released over a timeframe that is appropriate to the circumstances of each of its 32 member countries.

IEA members are primarily advanced economies in Europe, North America and Northeast Asia. The organization is tasked with maintaing global energy security. It was founded in 1974 in response to the oil embargo imposed by Arab producers over U.S. support for Israel during the 1973 Arab-Israeli war.

“The conflict in the Middle East is having significant impacts on global oil and gas markets, with major implications for energy security, energy affordability and the global economy for oil,” IEA Executive Director Fatih Birol said in remarks broadcast from the group’s headquarters in Paris.

“I can now announce that IEA countries have unanimously decided to launch the largest ever release of emergency oil stocks in our agency’s history,” Birol said.

The IEA chief said the release is designed to address the immediate impacts of the supply disruption. But tanker traffic must resume through the Strait of Hormuz to bring back stable oil and gas flows to the global market, Birol said.

The Strait is a narrow maritime corridor off Iran’s coast that connects the Persian Gulf and the Gulf of Oman. Roughly 20% of global oil and gas usually passes through it. Tanker traffic through the Strait has ground to standstill as shippers fear attacks by Iran.

Biggest supply disruption ever

The closure of the Strait has triggered the biggest oil supply disruption in history, according to analyses by consulting firms Rapidan Energy Group and Wood Mackenzie.

Energy analysts warned ahead of the release that even the IEA’s maximum drawdown capability would likely not be able to offset the nearly 20 million barrels per day that typically transits through the Strait of Hormuz.

Oil prices have been extremely volatile since the outbreak of the Iran war on Feb. 28, with global benchmark Brent crude rallying to nearly $120 a barrel at the start of the week, before falling back below $90.

Earlier in the day, Japanese Prime Minister Sanae Takaichi said the country intended to release oil stockpiles from its national reserves as early as next week, citing an “exceptionally high level of dependence” on the Middle East.

“Without waiting for an official decision on the release of international stockpiles in cooperation with the International Energy Agency (IEA), Japan has decided to take the lead in releasing its stockpiles as early as the 16th of this month in order to ease supply and demand in the international energy market,” Takaichi told reporters, according to public broadcaster NHK.

Read more U.S.-Iran war news

IEA members currently hold more than 1.2 billion barrels of public emergency oil stocks, with a further 600 million barrels of industry stocks held under government obligation.

The global energy watchdog had previously released an estimated 182 million barrels of oil to support the energy market following Russia’s full-scale invasion of Ukraine in 2022.

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