(Bloomberg) -- OPEC+ announced a surprise oil production cut of more than 1 million barrels a day, abandoning previous assurances that it would hold supply steady and posing a new risk for the global economy.

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It’s a significant reduction for a market where — despite the recent price fluctuations — supply was looking tight for the latter part of the year. Oil futures weren’t trading when the cut was announced on Sunday, but the inevitable price reaction could add to inflationary pressures across the world, forcing central banks to keep interest rates higher for longer and crimping economic growth.

Saudi Arabia led the cartel by pledging its own 500,000 barrel-a-day supply reduction. Fellow members including Kuwait, the United Arabia Emirates and Algeria followed suit, while Russia said the production cut it was implementing from March to June would continue until the end of the 2023.

“OPEC+ clearly want a higher price,” said Gary Ross, a veteran oil consultant turned hedge fund manager at Black Gold Investors LLC. The group “is following through on being proactive and ahead of the curve, and is trying to rip oil prices from the grip of” macro sentiment.

The initial impact of the cuts, starting next month, will add up to about 1.1 million barrels a day. From July, due to the extension of Russia’s existing supply reduction, there will be about 1.6 million barrels a day less crude on the market than previously expected. Russia initially moved to cut production in March, in retaliation against western sanctions prompted by its invasion of Ukraine.

Riyadh said on Sunday the cuts were a “precautionary measure aimed at supporting the stability of the oil market.”

The surprise move could once again flare tensions between the US and Saudi Arabia, a regional partner whose relationship with President Joe Biden’s administration has been tense. Biden made a controversial trip to the region last July, but came away without any commitments to pump more oil.

Then in October, when OPEC+ made a surprise production cut of about 2 million barrels day just weeks before the US midterm elections, Biden vowed there would be “consequences” for Saudi Arabia. But the administration did not follow through.

The White House did not immediately respond to a request for comment.

Oil Stabilized

The move on Sunday — announced a day before the OPEC+ monitoring committee is due to meet — was an unprecedented way to decide policy for the group, which has had to adapt in recent years first to the demand shock of the pandemic and now to the war in Ukraine and the fallout of sanctions.

As recently as Friday, delegates had been indicating privately that there was no intention to change their production limits.

Oil fell to a 15-month low last month due to the turmoil caused by the banking crisis, but prices had recovered as the situation showed signs of stabilizing. Brent crude, the international benchmark, closed just below $80 a barrel on Friday, up 14% from its March trough.

But that may not be high enough for the group. Back in October, the last time it made a massive cut that took consumers aback, Nigerian Minister of State for Petroleum Resources Timipre Sylva said the group “wants prices around $90.”

For its part, Saudi Arabia is embarking on a huge swathe of spending running into trillions of dollars to transform its economy into a tourism hotspot and global logistics and business hub. While much of that spending is driven by a few sovereign wealth funds that may not directly benefit from higher crude prices, government officials have said they will use surpluses to help accelerate domestic investments.

The actual reduction in supply may be smaller than the advertised volumes of around 1.6 million barrels a day, assuming that OPEC+ sticks with current reference levels for the cuts. Most OPEC+ members, like Iraq and Kazakhstan, are already producing significantly below their present quotas as they contend with under-investment and operational disruptions, and so may not need to make further curbs.

Still, the move will have surprised the market. All fourteen traders and analysts polled last week by Bloomberg predicted no change. They were taking their lead from Saudi Energy Minister Prince Abdulaziz bin Salman, who had said last month that the current OPEC+ production targets are “here to stay for the rest of the year, period.”

From time to time, the prince has delighted in wrong-footing speculators with unexpected supply changes. During one such intervention he warned that short-sellers would be “ouching like hell,” and for crude bears this latest move may be similarly painful.

--With assistance from Fiona MacDonald, Khalid Al-Ansary, Omar Tamo, Jordan Fabian and Nayla Razzouk.

(Updates with analyst comment in fourth paragraph, background.)

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