Ukrainian President Volodymyr Zelensky has accused Russian commanders of “craziness” in their efforts to capture the eastern town of Bakhmut.
The town – which sits in the Donetsk region and had a pre-war population of 70,000 – has been the centre of Russian attacks for months.
Despite a looming Ukrainian advance on the key city of Kherson, Mr Zelensky said the attacks continued in force.
Taking the town would be a symbolic victory for Russia.
The city sits on a main road leading to the Ukrainian-held cities of Sloviansk and Kramatorsk. While Russia is struggling elsewhere in Ukraine, its forces have made progress around Bakhmut in recent weeks.