This is footage purported to show Ukrainian troops entering Kupiansk with a tank in the early hours of this morning.
The video was shared online by a number of Ukrainian media outlets and journalists covering the war.
In recent days, the Ukrainian army in the east of this country made a series of successes in the counteroffensive, which was launched with the aim of liberating the parts under the control of the Russian army.
In just a few days, Balaklia, Kupyansk and Izyum fell one after the other.