Valentyn Zemlyansky, spokesman for state gas company Naftogaz, said Russia's gas giant Gazprom completely stopped sending gas to European consumers at 7:44 a.m. local time on Wednesday.
The dispute has resulted in a halt or limited supplies to at least a dozen nations. Tens of thousands of people have been left without heat and governments have scrambled to find alternate energy sources.
Russia says it has limited supplies for Europe because Ukraine has been stealing its gas. Ukraine blames Russia for the shortfalls. The cut-off began after the two neighbors failed to agree on prices for this year.