Ukraine says it’s pushed Russian troops right back to the border near the city of Kharkiv.

Ukrainian forces have been counter attacking and retaking territory in the north-east of the country in recent days.

The city of Izyum – known as the Gateway to Donbas – sits above the main body of Ukrainian forces holding back Russia's eastern push.

BBC correspondent Quentin Sommerville is on patrol with the men protecting this critical front line.

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