Russia has for years been muscling in on Asian markets where Saudi Arabia was once the unchallenged dominant supplier. But now Riyadh is retaliating in Moscow's backyard of Europe with aggressive price discounting.

Brent crude was down 24 cents at $49.00 a barrel. Prices have more than halved from June 2014. U.S. crude fell 39 cents to $46.27 a barrel.

DEA Deutsche Erdoel (DEA), a company based in Germany controlled by Russian billionaire Mikhail Fridman’s investment firm LetterOne, signed an agreement to buy 100% of E.ON’s shares in E.ON E&P Norge for $1.6 billion, explaining that the transaction will allow DEA doubling its current production in Norway.

Spanish oil major Repsol said on Wednesday its net profit could fall by up to 22 percent in 2015, hit by low crude prices and a loss of value of some of its North-American assets which will trigger a big impairment charge in the third quarter.

World economic growth has been revised down to 3.1% for 2015 and to 3.4% for 2016. While OECD growth remains unchanged at 2.0% for 2015 and 2.1% in 2016, major emerging economies are increasingly facing challenges. China’s and India’s growth forecasts have been revised down by 0.1 percentage points to now stand at 6.8% and 6.4% for China and at 7.4% and 7.6% for India in 2015 and 2016, respectively.

The demand outlook for next year is looking softer mainly due to recent downgrades to the macroeconomic outlook and expectations that crude oil prices will not see repeats of the heavy losses of 2015.

“Today’s vote starts us down the path to a new era of energy security, saving consumers billions and creating jobs across the country,” said API President and CEO Jack Gerard. “American producers would be able to compete on a level playing field with countries like Iran and Russia, providing security to our allies and accelerating the energy revolution that has revitalized our economy.

Crude oil production in November from seven major US shale plays is expected to drop 93,000 b/d to 5.12 million b/d. That’s back up to the same level forecast for September after a somewhat smaller decline was projected for October.

"Considerable uncertainties" surrounded the U.S. economic outlook, particularly the drag on exports from slowing global growth, low investment caused by the decline in oil prices and a “disappointing” recent drop in U.S. job growth.

The oil price collapse over the past 16 months has forced the world’s biggest energy companies to cut hundreds of billions of dollars in future spending to bolster their balance sheets. But Ali al-Naimi — oil minister and architect of the Saudi strategy to maintain output and keep prices low to hobble its rivals — voiced a commitment to press on with investments in exploration, production and refining.