Gazprom has commenced Russian natural gas supplies to Hungary and Croatia over the new route using the TurkStream gas pipeline.
Additionally, the state-owned firm said it has started gas supplies to national gas transmission systems of Hungary, Bulgaria, Serbia.
Supplies to Hungary follow the completion of a new gas trunkline built by FGSZ whereas the gas supplies to Bulgaria and Serbia transmission systems started with the commissioning of compressor stations by grid operators Bulgartransgaz EAD and GASTRANS.
TurkStream export gas pipeline, which stretches from Russia to Turkey across the Black Sea, is designed to transport 31.5 billion cubic metres (bcm) of gas per year.
It is also intended to deliver Russian gas to southern and south-eastern Europe through Turkish territory.
Separately, Gazprom has reported a gas production of 378.1bcm from January to September of 2021, an increase of 17.3% compared to the same period of last year, according to preliminary data.
In a statement, the firm said: "The company increased its gas exports to the countries beyond the FSU to 145.8bcm, which is the second-highest amount for nine months in the entire history of supplies (compared to 149.2bcm in 2018). This is higher than the figure for the same period of 2020 by 15.3% (or by 19.3bcm)."
Moreover, the firm said it is continuing to grow gas supplies to China via the Power of Siberia pipeline following the completion of scheduled maintenance.
The increase in production comes amid surging fuel prices in Europe.
Recently, Gazprom Export signed two contracts with Hungary's natural gas sales company MVM CEEnergy to supply up to 4.5bcm of gas per year in total to Hungary, bypassing Ukraine.