The Russian state-run gas giant has been looking to develop the 1090-kilometre route that would be laid across the Black Sea with landfall in Turkey and would be able to deliver 63 billion cubic metres of gas a year to the continent.

It is intended as a replacement route for the now scrapped South Stream pipeline and would provide an alternative conduit for Russian gas supplies to Europe bypassing transit country Ukraine where Gazprom has run into rows over pricing and unpaid bills.

 Gazprom