Bosnia's major gas importer Energoinvest said on Wednesday it had extended a deal on gas supplies with Russia's Gazprom until the end of the year under unchanged conditions.

Energoinvest stated it had signed an annex to its contract with Gazprom on Tuesday, under which the gas price 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 January 1, 2023, when the signing of the new annex of the contract is scheduled," the company mentioned in a statement.