Russia has invited Turkey to take part in its South Stream gas pipeline, in what could be another blow to the European Union-backed rival project Nabucco, the Interfax news agency reported late Wednesday citing First Deputy Prime Minister Igor Sechin.

Russia has invited Turkey to take part in its South Stream gas pipeline, in what could be another blow to the European Union-backed rival project Nabucco, the Interfax news agency reported late Wednesday citing First Deputy Prime Minister Igor Sechin.

"We have offered Turkey cooperation with the South Stream," Sechin said after a meeting with Turkish Energy Minister Taner Yildiz. Sechin didn't specify what role Turkey would play in the pipeline, which under its current route doesn't cross Turkish territory.

The South Stream - a joint project between Russia's OAO Gazprom (GAZP.RS) and Italy's Eni SpA (E) - will when finished carry natural gas under the Black Sea from Russia to Bulgaria and then via branches to Austria and Italy.

The South Stream is considered a rival project to the Nabucco pipeline, in which Turkey plays a crucial role. Nabucco - meant to ease Europe's dependence on Russian gas - will ship gas from energy-rich Central Asian countries like Azerbaijan, Turkmenistan and Uzbekistan via Turkey to Austria and other European countries.