Bosnia’s major gas importer Energoinvest said on Wednesday that it has extended a deal on gas supplies with Russia’s Gazprom until the end of the year under unchanged conditions. Energoinvest said it signed an annex to its contract with Gazprom on Tuesday, under which the price for gas will be corrected on a quarterly basis as was already the case, based on the nine-month change in the price of oil derivatives. “The signing of this annex enables a continued free supplying of the Federation of Bosnia-Herzegovina with natural gas until Jan. 1 2023, when the signing of the new annex of the contra…