The governor of the eastern Donetsk region has urged 350,000 civilians to evacuate in light of an imminent Russian offensive.
The call comes a day after Russian President Vladimir Putin declared victory in seizing the the neighbouring eastern province of Luhansk.
Donetsk governor, Pavlo Kyrylenko, said that getting the 350,000 people remaining in Donetsk province out is necessary to save lives and to enable the Ukrainian army to better defend towns from the Russian advance.
"The destiny of the whole country will be decided by the Donetsk region.
Once there are less people, we will be able to concentrate more on our enemy and perform our main tasks.”
Another Donetsk city came under sustained bombardment on Tuesday.