Front-month Brent crude futures were at $69.53 a barrel at 0641 GMT, down 58 cents, or 0.8%, from last session’s close. U.S. West Texas Intermediate (WTI) crude futures were at $58.46 per barrel, down 70 cents, or 1.2%, from their last settlement.

Spot Brent crude futures were firmer at $68.82 per barrel, 13 cents, or 0.2%, above their last close. WTI crude futures were at $58.43 per barrel at 0700 GMT, down 20 cents, or 0.3%, from their last settlement.

Venezuela's state-owned PDVSA exported 1.416 million barrels of combined crude and products in May to Cuba's state Cubametales, up from 355,000 barrels in April.

Brent crude futures were at $68.48 per barrel at 0654 GMT, up 72 cents, or 1.1%, from their last close, with prices underpinned by OPEC supply cuts and Middle East tensions. U.S. West Texas Intermediate (WTI) crude futures were up 66 cents, or 1.1%, at $58.57 per barrel.

Although compliance to the cuts had a slow start, OPEC's JMMC noted in a press release following their meeting in Jeddah, Saudi Arabia, that compliance had hit a record high of 168% in April 2019. Average conformity reached 120% since January 2019.

Russia’s GDP unexpectedly grew just 0.5% in the first quarter, below all 14 estimates in a Bloomberg survey. That compares with a 2.7% increase in the last three months of 2018, which was the highest in more than six years as crude output reached a record 11.45mn barrels a day in December, according to ministry data as Opec+ curbs eased.

Brent crude futures were at $70.36 per barrel, down 63 cents, or 0.9%, from their last close. U.S. West Texas Intermediate (WTI) crude futures were down by 51 cents, or 0.8%, at $60.91 per barrel.

Brent crude futures were down 39 cents, or 0.5 percent, at $71.79 at barrel. WTI crude futures for July delivery were down 59 cents, or 0.9 percent, at $62.54.

Brent crude futures, the international benchmark for oil prices, were at $72.31 per barrel at 1030 GMT, up 34 cents, or 0.5 percent, from their last close. U.S. West Texas Intermediate (WTI) crude futures were up 42 cents, or 0.7 percent, at $63.52 per barrel.

Following its 14th Meeting, which took place on 19 May 2019, in Jeddah, the Kingdom of Saudi Arabia, the Joint Ministerial Monitoring Committee (JMMC) has reaffirmed its commitment to achieving a balanced market and working towards oil market stability on a sustainable basis with solid fundamentals.

"We want to bring inventories down to a more normal levels," Falih said. "We need to stay the course and do that in the weeks and months to come."

Russia sees a range of options that would allow OPEC+ to continue output cooperation until year-end, from easing the limits to ending the extreme throttling-back that has seen some countries exceed original cutback targets.

Brent crude was up by 90 cents, or 1.3%, at $73.11 a barrel, U.S. West Texas Intermediate crude was up 71 cents, or 1.1% higher, at $63.47 a barrel.

OPEC+ would take action to offset losses of Iranian supply if market fundamentals justified it. However, no policy changes will be made until the next full OPEC+ meeting in Vienna, in June.

Crudes are being priced at Dated Brent discounts between $15/b and $17/b, FOB, according to a PDVSA report.