Russian forces have withdrawn from key eastern towns, as a rapid Ukrainian counter-attack makes further gains.
Ukrainian officials said troops entered Kupiansk, a vital eastern supply hub for Russian forces, on Saturday.
Special forces posted photos on social media which they said showed their officers in the town.
Separately, Russia’s defence ministry told state media that its troops have retreated from the nearby town of Izyum to allow them “to regroup”.
The ministry also confirmed the withdrawal of troops from a third key town, Balaklyia, in order to “bolster efforts” on the Donetsk front.
Read more at BBC.com