Kyiv confirms that its flow of natural gas has been reduced but it remains unclear just how much Ukrainian -- or, further downstream, Western European -- gas supplies might be affected.
Last-ditch talks to resolve a row over gas prices appeared to be deadlocked, and Ukrainian Prime Minister Yulia Tymoshenko canceled a plan to fly to Moscow to join the negotiations.
Ukraine said it guaranteed supplies of Russian gas through its territory to Europe, contradicting Russian gas giant Gazprom, which alleged Kyiv was planning to confiscate gas bound for Europe if Moscow cuts off supplies to Ukraine.
Russia and Ukraine are locked in intense gas supply talks amid signs they are inching toward a deal ahead of a January 1 deadline when Moscow has said it will cut off its neighbor, possibly disrupting flows to the EU.
Russia's Gazprom has said that gas prices for Ukraine could more than double next year if the two countries, trying to clinch a last-minute gas suppply deal, switch to market terms in gas trade.
Crisis-stricken Ukraine may count its $2 billion debt for Russian gas deliveries against future fees for Russian gas transit to European customers, a Gazprom spokesman has said.
Ukraine's fractious parliament has adopted a 2009 budget with a 3 percent deficit -- at odds with conditions set by the International Monetary Fund for an $16.5 billion economic rescue package.
The death toll in a blast that ripped through a five-story apartment block in southern Ukraine has risen to 27 people, the Emergency Situations Ministry has said.
Russian President Dmitry Medvedev has said Ukraine's economy will face "sanctions and demands" from Russia if Kyiv does not pay off its gas debt.
Seventeen people have been killed and at least 10 more are missing after an explosion ripped through an apartment block in a Ukrainian Black Sea resort town of Yevpatoria.
President Dmitry Medvedev has threatened that Russia could impose sanctions on Ukraine if Kyiv doesn't pay its gas debt to Russia.
A serial killer in the eastern Ukrainian city of Dnipropetrovsk has been sentenced to life in prison, RFE/RL's Ukrainian Service reports.