Any decision to build a pipeline to transport Russian gas through Turkey should be made in consultation with the European Union and should not breach pre-existing legal commitments, the European Commission's energy chief said.
Russia in December abandoned its $40 billion South Stream project after objections from the EU over potential excessive Russian control of European gas supplies through a pipeline that would have passed under the Black Sea to Bulgaria and carried up to an annual 63 billion cubic metres (bcm) of gas to Europe.
Instead, Russian gas exporter Gazprom announced in January its intention to build an undersea gas pipeline with the same capacity to an as yet unbuilt hub on the Turkish-Greek border by the end of 2016.
During a visit to Turkey, Maros Sefcovic, the European Commission's Vice President in charge of Energy Union, said that no details on the Russian proposal had been received and that any plans should be economically viable and compatible with Gazprom's obligations to its long-term European customers.
"When we speak about some big supplies for European customers, you cannot adopt such a decision without talking to them, without talking to the EU and without talking to the European Commission," Sefcovic said at a press briefing in Ankara on Monday evening.
He also expressed concern over the potential switching off of existing routes via Ukraine in favour of the proposed Turkish Stream.
"If all this should just change like that, I don't think this is ordinary procedure and that this is how such a big client like the EU should be treated," Sefcovic added.
The EU is the world's largest energy customer, spending 400 billion euros ($423.7 billion) a year on oil and gas imports. ($1 = 0.9441 euros)