European officials expressed frustration at Russia and Ukraine's inability to enforce an agreement to resume delivery of natural gas, amid heat and cooking gas shortages and sub-zero temperatures endured by millions of people.
German Chancellor Angela Merkel was expected to meet Friday with Russian Prime Minister Vladimir Putin and his Ukrainian counterpart Yulia Timoshenko in an emergency meeting in Berlin. Merkel said she was likely to reinforce the EU's position as a natural gas customer.
"There is a risk that the confidence in Russia may be lost due to the ongoing disruption," said Merkel. 
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CNN's Jim Boulden and Matthew Chance contributed to this report.
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