The European Union is bracing for another potential energy crisis in the dead of winter as Russian gas supplies to some of its member states suddenly have dwindled by up to 30 percent.

The European Commission put its gas coordination committee on alert Friday, but insisted the situation had not yet reached an emergency level since coordination between nations to help each other had improved and storage facilities had been upgraded.

Commission spokeswoman Marlene Holzner said Russia was going through an extremely cold spell and needed more gas to keep its citizens warm.

She said that Russia's gas contracts "allow for certain flexibility in case they also need the gas. And that is the situation that Russia is facing at the moment." The severe winter in Russia has seen temperatures drop to minus 35 C (minus 30 F).

Moscow has blamed Ukraine for the shortages, saying Kiev is siphoning off more than its share. Authorities in Ukraine have denied the accusation.

Ukraine's Fuel and Energy Minister Yuri Boiko said Friday that Russia was shipping some 15 percent less gas than usual because of increased domestic consumption due to the cold weather.

Twice over the past decade, disputes between Russia and Ukraine turned into European emergencies as gas supplies diminished, leaving the prospect of tens of millions of people across the continent without heat.

The EU has improved coordination within the bloc to make sure Europeans would not be held hostage in another payment dispute between Russia and Ukraine.

Holzner said the policy was paying off as gas deliveries this week slowed to Poland, Slovakia, Austria, Hungary, Bulgaria Romania, Greece and Italy. She said that Poland was able to get some gas destined for Germany this week and that new storage facilities in countries like the Czech Republic and Slovakia were proving their value. Countries also now must have one month worth of gas supplies.

The gas deliveries to Austria were down by 30 percent in Austria on Thursday and 24 percent in Italy.

"It is not a situation of emergency yet," Holzner said.

To stave off a potential crisis, the EU alerted gas authorities, industry, consumer representatives and member states in a first step to meet the challenges ahead. A special meeting could be called in the days ahead if the situation worsens.