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Fierce fighting is continuing in eastern Ukraine, hours before a ceasefire is due to come into force at midnight (22:00 GMT).

A police chief said the strategic town of Debaltseve was suffering a ferocious bombardment by pro-Russian rebels.

Renewed fighting is also reported near the southern port city of Mariupol.

Meanwhile, the US ambassador to Ukraine tweeted recent satellite images that he said showed Russian artillery near Debaltseve.

Geoffrey Pyatt also said on Twitter that Russian units along the border were preparing a large shipment of supplies to separatist fighters.

He said that the rebels were now better armed than some Nato countries.

AP Rebel fighters have continued to besiege the government-held town of Debaltseve

Ukraine and the West accuse Russia of sending troops and weapons to help the separatists in Ukraine's eastern Donetsk and Luhansk regions - a claim the Kremlin vehemently denies.

"The militants are destroying Debaltseve," Donetsk region police chief Vyacheslav Abroskin was quoted as saying on the censort.net website.

"The shelling of residential areas and civilian buildings continue. The city is on fire. There has been a direct hit from Grads (rockets) on the city police station."

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