Russia says Ukrainian forces have killed 89 Russian troops in a missile strike in the Donetsk region, blaming the deadly attack on the illegal use of mobile phones by its troops.

The dam supplies water to Russia's Crimean Peninsula and to the Zaporizhzhia nuclear plant.

Russia has asked civilians to evacuate the city of Kherson in anticipation of a wider Ukrainian counteroffensive.

Kupyansk was captured by Russian forces less than one week after Moscow launched its full-scale operation.

A Press TV correspondent says it is only a matter of time until Russian forces take Ukraine's strategic city of Lysychansk, the twin city of Severodonetsk in the Donbass, as Moscow pushes ahead to capture the entire eastern Ukrainian region.

Azov Regiment commander says Kiev has ordered the remaining Ukrainian soldiers still trapped in the besieged Azovstal steel plant in Mariupol to stop fighting.

Russia has given the Ukrainian soldiers still holding out in the strategic southern port city of Mariupol a new ultimatum to surrender, as Moscow pushes a new military offensive in Ukraine's east.