Gazprom's gas prices are pegged to oil with a six-month lag, which means its customers are currently paying the equivalent of $45-$50 per barrel seen in January 2015 when oil prices crashed following a decision by OPEC not to reduce output.

Russia's economy is showing signs of stabilisation after slumping under pressure from Western financial sanctions and Russian counter-measures. Low international prices for its oil exports have added to pressure on the rouble and government finances.

Russia is the world's largest producer of crude oil (including lease condensate) and the second-largest producer of dry natural gas. Russia also produces significant amounts of coal. Russia's economy is highly dependent on its hydrocarbons, and oil and natural gas revenues account for more than 50% of the federal budget revenues.

Gazprom is first and foremost a tool of Russian foreign policy, which Putin is not shy about wielding to pursue Russian interests. During Putin’s years in power, the Kremlin has used its control over Gazprom — increasing or decreasing the cost of energy — to maintain influence over Russia’s neighbors. Putin once described Gazprom as “a powerful political and economic lever of influence over the rest of the world,” and a team of Russian foreign policy experts noted that “if the leaders of this or that country decide to show good will towards the Russian Federation, then the situation with gas deliveries, pricing policy and former debts changes on a far more favorable note to the buyer.”

OPEC and Russia say they expect the global oil market to become more balanced and stable next year after the recent sharp drops.

Fifteen nations, more than half of them from the former Soviet bloc, endorsed an action plan to improve energy infrastructure and ultimately to ensure each of them maintains three separate sources of supply. Ministers meeting in Dubrovnik, Croatia, with Maros Sefcovic, the European Commission’s vice president in charge of energy union, chose seven gas link projects that should be sped up and that may be eligible for financial support.

This month the head of the EBRD said the bank could invest hundreds of millions of dollars in Ukraine's energy sector this year, but that any investment would depend on Kiev implementing long-promised energy sector reforms.

Rotterdam, Europe's largest port, said on Thursday that plans to build a Russian-backed 3 million cubic meter oil storage terminal had been canceled after its Russian partner raised concerns over the project's feasibility.

For many years, Russia has advocated that the frequent gas interruptions are the fault of transit states such as Ukraine, whom the Kremlin sees as unreliable. As a result, Gazprom rolled out several pipeline projects that would bypass Ukraine altogether and provide a direct route to its customer base in Europe.

“It’s a serious problem not just for the United States but for the whole world economy. Debt exceeds gross domestic product there.”