A pressure gauge is pictured at an underground gas storage facility in the village of Mryn, 120 km (75 miles) north of Kiev May 21, 2013 file photo. Ukraine's Naftogaz halted Russian natural gas ... more 
A pressure gauge is pictured at an underground gas storage facility in the village of Mryn, 120 km (75 miles) north of Kiev May 21, 2013 file photo. Ukraine's Naftogaz halted Russian natural gas imports last Friday in a dispute over pricing, sources in the industry and at Russia's Gazprom told Reuters on November 11, 2013, but the flow to Europe via Ukraine was so far unaffected. REUTERS/Gleb Garanich/Files (UKRAINE - Tags: ENERGY POLITICS) less 
1 / 7
Reuters | Photo By GLEB GARANICH / REUTERS
Tue, Nov 12, 2013 4:21 AM EST