"Opec and non-Opec countries participating in the Declaration of Cooperation remain unwavering in their commitment to contribute to market stability, in the interests of producers, consumers and the global economy", Mazrouei said in a statement.
The price rose above $78 a barrel after an Iranian Revolutionary Guards commander said he was ready to prevent regional crude exports if Iranian oil sales were banned by the United States.
The president, in an interview with Fox News's "Sunday Morning Futures with Maria Bartiromo also piled pressure on close U.S. allies with a threat to sanction European companies that do business with Iran".
This has been U.S. policy since President Donald Trump pulled out of the Iran nuclear accord on May 8, but many foreign capitals have been demanding waivers to allow some trade to continue.
OPEC pledged to relax compliance with an agreement that helped balance an oversupplied market, but that might not be enough to address a looming deficit of around 2 million barrels per day. "So in the options market, the volatility gets bid up", he told the Reuters Global Oil Forum.
The US government says a move to reimpose sanctions on Iran remains on track. Tehran, however, vowed on Sunday to foil any USA bid to block its oil exports.
The Saudi Cabinet "affirmed the Kingdom's readiness to use its spare capacity when needed to deal with any future changes in oil supply and demand rates, in co-ordination with other producing countries", according to a report by the Saudi Press Agency.
Oil futures fell Monday as supplies from Saudi Arabia and Russian Federation rose while economic growth stumbled in Asia amid escalating trade disputes with the United States.
"We will surely do something to thwart the U.S. rallying cry that Iranian oil must be stemmed", First Vice President Eshagh Jahangiri said in statements broadcast on state television.
Libya's National Oil Corporation declared "force majeure", or unforeseeable circumstances, as the country's continued struggles with internal conflicts see approximately 850,000 barrels per day after losing control of Zueitina and Hariga ports this week.
The US ultimatum has also contributed to upward pressure on world oil prices, although Trump believes he has persuaded Saudi Arabia to offset this by ramping up its own production. "If production increases as we now forecast, a large share of this would be eroded, leaving the global oil market with a limited "margin of safety", said Morgan Stanley's Rat.
The president also had tough words for other U.S. allies.
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