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Sky's Deborah Haynes reports from the frontline.

This video released by Valery Zaluzhny, the chief commander of the armed forces of Ukraine, appears to show a Russian missile system being destroyed by a drone. Sky News could not independently verify this footage.

Footage shows Ukrainian troops firing anti-tank weapons at a Russian T-80BVM tank north of Pytomnyk, a town just six miles from the Russian border in Kharkiv Oblast.