Investing.com - Oil higher Monday amid ongoing geopolitical tensions after U.S. air strikes against Syria last week.
U.S. crude was up 38 cents, or 0.73%, at $52.62 at 05:15 ET. Brent crude added 45 cents, or 0.81%, to $55.69.
The U.S. move sparked concerns about potential disruptions to supply.
Major producers Russia and Iran condemned the U.S. military action.
Gains were capped by a further increase in U.S. drilling activity.
Baker Hughes Friday reported a rise in the U.S. rig count data of 12 to 672.
The rig count has now risen for 12 weeks in a row.
Higher U.S. output could undermine the impact of cuts by major producers.
OPEC, non-OPEC producers cutting output by 1.8 million b/d in first half.
Hopes remain intact about a possible extension of the cuts beyond June.