Record-low temperatures in parts of Eastern Europe pushed the death toll from Arctic conditions to at least 89 people on Wednesday, and have forced Russian gas provider Gazprom to warn over supplies to Europe.

Europe had enjoyed a relatively mild winter up until last weekend, when a Siberian system swinging in from the east brought that to an abrupt halt.

A source at the Russian gas export monopoly, which supplies a quarter of Europe's gas imports, said it was getting more requests from export markets than it could physically accommodate as demand from Russia spikes. "Despite increasing gas consumption in Russia due to heavy frosts, Gazprom continues implementing its contractual obligations to European clients," it said.

In Ukraine, 43 people have died in the past five days, its emergency ministry said, as the former Soviet republic shivered through its coldest winter in six years.

Overnight temperatures sank as low as -33 C, and hundreds of heated tents have been put up to shelter the homeless.

"They say the whole February will be cold, and the first half of March, so we have to get ready for this somehow," said Viktor, who is living on the streets of Kiev.

European weather alert network Meteoalarm warned of "extremely dangerous" conditions in several parts of Eastern Europe, including Serbia, where a fourth person was found dead overnight in the southwestern Suvobor mountains.

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