A pressure valve is pictured at a natura

A pressure valve is pictured at a natural gas control centre of Turkey’s Petroleum and Pipeline Corporation, 35 km (22 miles) west of Ankara, on January 7, 2009. Supplies of Russian gas to Bulgaria, Greece, Macedonia and Turkey were still halted for a second day today amid a Russian-Ukrainian price spat, the Bulgarian minister of economy and energy said on January 6. AFP PHOTO / ADEM ALTAN (Photo credit should read ADEM ALTAN/AFP/Getty Images)

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