(VOVworld)- Russia's top natural gas producer Gazprom said on Wednesday that Ukrainian energy firm Naftogaz had paid it $150 million for gas supplies in January. Last week, Gazprom said it had received a $1.65 billion payment from Ukraine to cover the country's gas debts. The Russian energy major failed to name the exact gas amount for the Ukrainian company in January, because the amount remaining from December prepayment should be specified and the price should be calculated according to the formula. Russian gas price for Ukraine is expected to go down from $378 per 1,000 cubic meters to $365 in the first quarter. Ukraine’s Naftogaz said earlier on Wednesday that the company had transferred advance payment to Gazprom for January delivery and hopes to receive one billion cubic metres of gas.