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This picture taken on October 31, 2013, shows a worker welding pipes during the symbolic start of the construction of the Bulgarian section of Russian gas giant Gazprom's South Stream pipeline near the village of Rasovo. Russia's EU envoy on June 9 slammed Bulgaria's decision to suspend work on a Kremlin-backed South Stream gas pipeline under pressure from Brussels, calling it a "creeping shift to economic sanctions against Russia". AFP PHOTO / BULPHOTO / M3 COMMUNICATIONS GROUP 

== RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / BULPHOTO / M3 COMMUNICATIONS GROUP" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS ==-/AFP/Getty Images
This picture taken on October 31, 2013, shows a worker welding pipes during the symbolic start of the construction of the Bulgarian section of Russian gas giant Gazprom's South Stream pipeline near the village of Rasovo. Russia's EU envoy on June 9 slammed Bulgaria's decision to suspend work on a Kremlin-backed South Stream gas pipeline under pressure from Brussels, calling it a "creeping shift to economic sanctions against Russia". AFP PHOTO / BULPHOTO / M3 COMMUNICATIONS GROUP 

== RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / BULPHOTO / M3 COMMUNICATIONS GROUP" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS ==-/AFP/Getty Images

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    EU still optimistic about South Stream

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EU still optimistic about South Stream

CNN's Maggie Lake speaks Maros Sefcovic, European Commissioner for Energy Union, about the South Stream pipeline project.

EU still optimistic about South Stream

CNN's Maggie Lake speaks Maros Sefcovic, European Commissioner for Energy Union, about the South Stream pipeline project.