KYIV, Aug 23 – Naftogaz has not been buying natural gas under a contract with Russia's PJSC Gazprom for 1,000 days, since November 26, 2015, importing gas from the West.

As reported, inconsistent prices were behind Ukraine's refusal to buy gas on its eastern border at the end of 2015. Late in December 2017, the Arbitration Institute of the Stockholm Chamber of Commerce revised the contractual formula in a contract between Naftogaz and Gazprom. By arbitration decision, the price of gas for Naftogaz shall be equal to the price of gas in the hub in Germany, whereas previously it depended on the price of gas oil and fuel oil.