Satellite images have picked up what is thought to be an eight-mile long Russian military convoy moving towards Kharkiv in eastern Ukraine.

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The convoy, spotted near the town of Velkyi Burluk, contains trucks pulling artillery and fits the warnings from Ukraine's government that a massive assault in the east is imminent.

Heavy shelling has been reported in the Donbas region and the airport in Dnipro is said to have been destroyed but nine humanitarian corridors had been agreed between both sides to let civilians flee today.

There are also reports that a mass grave containing dozens of bodies of civilians has been found in the village of Buzova near Kyiv.

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