Oil prices slid for a third day in New York after Russia signaled that phasing out historic supply curbs that eliminated a worldwide glut may be on the table.

West Texas Intermediate futures slipped as much as 1.8 per cent on Thursday, extending the pullback from a three-year high. Russia and the Organization of Petroleum Exporting Countries will discuss whether it’s appropriate to scale back output cuts, Russian Energy Minister Alexander Novak said in St. Petersburg, adding that Russia and Saudi Arabia agree market conditions will dictate any decision.

Russia and other members of the OPEC-led coalition of oil producers are broaching the possibility of easing output limits at a time when American shale drillers are pumping record amounts of crude. Still, the dual threat of supply disruptions from Iran and Venezuela -- which together account for about 14 per cent of OPEC’s production -- may arrest any steep price slide.

“The discussions over OPEC possibly raising production is definitely raising some concern,” said Phil Flynn, an analyst at Price Futures Group in Chicago.

West Texas Intermediate for July delivery slid 70 cents to US$71.14 a barrel at 11:05 a.m. on the New York Mercantile Exchange.

Brent futures for July settlement were down 65 cents at US$79.15 on the London-based ICE Futures Europe exchange, and traded $8.01 a barrel above WTI. That spread closed at the widest since April 2015 on Wednesday.

The benchmarks are diverging as rising inventories in the U.S. weigh on American futures while risks to supply from Iran to Venezuela buoy Brent. A lack of pipelines in the prolific Permian Basin shale play in Texas is exacerbating the swelling U.S. surplus as American production tops 10 million barrels a day.

U.S. inventories expanded by 5.78 million barrels to about 438 million barrels last week, data from the Energy Information Administration showed. That was a surprise increase compared with the 2 million-barrel decline predicted in a Bloomberg survey.

Still, traders and analysts are expecting stockpile withdrawals in coming weeks that should support prices. Data provider Genscape Inc. was said to report that inventories fell by about 475,000 barrels between May 18 and May 22 at the key pipeline hub in Cushing, Oklahoma.

Yuan-denominated futures for September delivery were up 0.1 per cent to trade at 485 yuan a barrel on the Shanghai International Energy Exchange. The contract declined 0.1 per cent to 484.6 yuan on Wednesday.

The U.S. and Venezuela expelled each other’s top diplomats after President Donald Trump’s administration imposed sanctions in the wake of a disputed election in the Latin American nation.

Other oil-market news:

Gasoline for June delivery fell 0.6 per cent to US$2.2462 a gallon Citigroup Inc. sees curtailment of oil and gas production in the U.S. Permian region as a “real possibility” because of a shortage of takeaway pipeline capacity OPEC and allied oil producers including Russia are discussing new ways of measuring global crude stockpiles, signaling a possible decision that could affect production cuts they’re making to ease a global glut Senate Democrats led by Chuck Schumer urged President Donald Trump to “ stand up to OPEC” and get the group to moderate oil prices” Darren Woods is mounting a strong defense of his plan to rescue Exxon Mobil Corp. from its share-price slump with a multi-billion dollar investment spree that’s at odds with the belt-tightening undertaken by rivals