The G7 has announced 100 million barrels of oil and diesel will be released to ease supply concerns that have caused prices to skyrocket.

It includes a "substantial release" of diesel within 20 days, with discussions around "additional diesel releases as necessary", G7 leaders said in a statement.

The group of advanced economies, including the US, said the move would begin immediately and would last for four months.

Under the measures, which come after US President Donald Trump had threatened to ban diesel exports, there will not be any "export restrictions on energy and energy products" between G7 members.

The G7 includes the US, UK, Canada, Japan, Germany, Italy and France, with the EU also represented at its meetings.

Donald Trump had warned he would ban diesel exports from the US if European countries did not agree to put more of their own stocks onto the market. That would have eased pressure on prices for US consumers ahead of November's midterm elections, but pushed up prices elsewhere.

On Friday, he said on social media: "Europe has just agreed to release a massive amount of their heavily stocked Diesel Oil. The process will begin immediately."

His Treasury Secretary Scott Bessent had argued US farmers, truckers, and businesses "should not be left carrying the burden" as prices soar.

Speaking later at the White House, Trump said an export ban on diesel was "never really on the table".

Referring to the decision by the G7 to release fuel from reserves, he added that "what Europe did was a great thing."

"Europe has a lot of diesel and they're going to be making a major world contribution - and so are we," he said.

"And we're not going to be doing the export ban, we're going to be doing what we're supposed to do."

Trump had first said he backed a diesel export ban early last week, and was still considering it on Thursday, as his administration put pressure on Europe to tap its supplies.

Diesel is used heavily by the haulage industry and in agriculture, meaning rises in the cost of the fuel feed through into essentials such as food.

Following a meeting of G7 leaders, French President Emmanuel Macron said the bloc had agreed to release reserves of "up to 100 million barrels" within four months under the co-ordination of the International Energy Agency (IEA).

The UK was represented at the meeting by Foreign Secretary Ed Miliband, who said the measures would "stabilise energy supplies, build resilience in supply chains and shield households and businesses from price shocks".

Macron said the co-ordinated action would "bring down the prices of petroleum products, particularly diesel". Highlighting the agreement not to pursue export bans, Macron said "President Trump, in particular, was very clear on this point".

In the joint statement, G7 leaders said: "We will implement our commitments with a co-ordinated release through the IEA of 100 million barrels to begin immediately over four months, including a frontloaded substantial diesel release within the first 20 days by G7 members and partners."

It is not yet clear which partner countries will release stocks, nor how quickly.

The 100 million barrels will comprise a mix of diesel and crude oil. The price of global benchmark Brent crude oil briefly dropped below $100 a barrel, but rose back to around $102 by Friday evening. Before the US and Israel invaded Iran, it was trading at around $73.

Matt Smith, director of commodities research at Kpler, said oil had risen again due to renewed strikes between Saudi Arabia and the Houthis in Yemen.

"Oil prices were selling off strongly due to the announcement of strategic stock releases in Europe, but they reversed course on rumours of Saudi Arabia planning an offensive into Yemen as it looks to re-establish a safe path via Bab-Al Mandeb," he said.

European countries had pushed back against US threats to turn off American diesel, against a backdrop of the US-led war in the Middle East and reduced supplies from Russia and China.

The G7 leaders said they will also co-ordinate maintenance schedules to avoid multiple refineries being shut down at the same time, while encouraging countries with the capacity to do so to ramp up refining of diesel in particular.