This is what you need to know about Sunday's decision by some members of the Organization of the Petroleum Exporting Countries (OPEC) and their allies:
Why Cut Oil Production Further?
Independent of the broader OPEC+ output policy, eight members of the bloc led by heavyweight Saudi Arabia announced they would cut a further 1.16 million barrels per day of production until the end of the year.
It came on top of a decision from Russia, also an OPEC+ member, to extend a cut of 500,000 barrels per day.
Unlike two previous cuts, several members preferred to act independently on Sunday, without going through the formal framework of the alliance that requires the agreement of the 13 countries of the OPEC cartel and its 11 partners (OPEC+).
"What we are witnessing is an adaptive and agile OPEC+ group which is able and willing to act ahead of the curve," SEB analyst Bjarne Schieldrop said.
Established in 1960, Vienna-based OPEC aims to "coordinate and unify petroleum policies" of its members to ensure "fair and stable prices for producers".
To form the OPEC+ alliance, the organisation in 2016 included non-OPEC oil-producing countries led by Russia.
Oil prices have suffered greatly from the banking crisis in the United States and Europe, with fears of a global recession resurfacing and investors shifting away from riskier assets such as commodities.
"To the dismay of global leaders, OPEC has decided to draw a hard line at Brent $80 per barrel for self-serving economic interests," said SPI AM analyst Stephen Innes.
How Will Moscow Profit From The Decision?
The rise in crude oil prices particularly benefits Russia, which "needs oil-money for its expensive war in Ukraine", said Schieldrop.
The cuts "will tighten up the oil market and thus help Russia to secure better prices for the crude oil it sells", he added.
Targeted by numerous Western sanctions for invading Ukraine, Russia has seen revenues from crude exports capped and the markets where it can sell limited.
According to Schieldrop, the new cuts also confirm "that Russia is still an integral and important part of the group".
The consequences of Sunday's decision are all the greater because, unlike the cuts previously made by the group at the height of the pandemic or last October, "the momentum for global oil demand is up, not down" with a strong recovery of China expected, said Innes.
Prices were immediately impacted, with the two global crude references jumping about eight percent in early Monday trading.
The surprise reduction further consolidates the Saudi-Russian marriage of convenience, by aligning their production levels, thus placing them on equal footing.
A Slap In The Face For Washington?
The White House shrugged off the output cut, saying it will have limited impact on the US economy.
"We don't think that production cuts are advisable at this moment, given market uncertainty," National Security Council spokesman John Kirby told reporters.
The United States "made that clear," he said, but "we're focused on moving ahead here."
Asked about the troubled relationship with Riyadh, Kirby said the kingdom "is still a strategic partner" but "we don't always see eye to eye on everything."
The latest production cuts were not sprung as a complete surprise to the US government, he added: "We were given a heads up."
The cuts represent "a provocation for the oil consuming nations, which are struggling with increasing interest rates and high inflation numbers," said DNB analysts said.
For Finalto analyst Neil Wilson they also signal a new era, in which "the Saudis are not afraid of the US" as OPEC "leverage" is on Riyadh's side.
"The Saudis are doing what they need to do and the White House has no say," he noted, adding that "a recasting of regional and global dynamics" has been set in motion.
"OPEC+ has sent a firm signal that... it does not see shale oil production growth as a threat to its market share," DNB analysts said.
With US shale oil production growth muted, production cuts by the alliance will not lead to any market share losses.
While "more political wrangling between US and OPEC is likely", the Biden administration won't use "the SPR (strategic petroleum reserve) inventories to counter the OPEC cuts", according to DNB analysts added.