Russian forces have made a “frenzied push” to seize half of Sievierodonetsk, the eastern Ukrainian city that is key to Moscow’s efforts to complete the capture of the industrial Donbas region, the mayor said.
“The city is essentially being destroyed ruthlessly block by block,” Oleksandr Striuk said.
He said heavy street fighting continued and artillery barrages threatened the lives of the estimated 13,000 civilians still sheltering in the ruined city that once was home to more than 100,000.
A Russian air strike on Sievierodonetsk hit a tank of nitric acid at a chemical factory, causing a huge leak of fumes, according to Serhiy Haidai, governor of the Luhansk region.
He posted a picture of a big cloud hanging over the city and urged residents to stay inside and wear gas masks or improvised ones.
The mayor said more than 1,500 residents have died of various causes since Russia’s invasion of Ukraine in late February. Evacuation efforts have been halted because of shelling.
“Civilians are dying from direct strikes, from fragmentation wounds and under the rubble of destroyed buildings, since most of the inhabitants are hiding in basements and shelters,” Mr Striuk said.
Electricity has been cut off and people need water, food and medicine, and the mayor added: “There are food supplies for several more days, but the issue is how to distribute them.”
Sievierodonetsk is important to Russian efforts to capture the Donbas before more western arms arrive to bolster Ukraine’s defence.
Moscow-backed separatists have been fighting Ukrainian troops in the region for eight years and held swathes of territory even before the invasion.
The city, 90 miles south of the Russian border, is in an area that is the last pocket under Ukrainian government control in the Luhansk region.
The Donbas is made up of the Luhansk and Donetsk regions.
In his nightly video address, Ukrainian President Volodymyr Zelensky said the situation in the Donbas remains “extremely difficult” as Russia has put its army’s “maximum combat power” there.
At least three people were killed and six wounded overnight in a Russian missile strike on the city of Sloviansk, west of Sievierodonetsk, Donetsk governor Pavlo Kyrylenko said in a Facebook post. A school was among several buildings damaged.
A crater was blasted in the road between two apartment buildings heavily pockmarked by shrapnel.
The floor and stairwell of one building were smeared with blood.
Resident Olena Voytenko, 59, said she knew one of the people killed, a man whose apartment caught fire in the blast.
Another resident, Mikhaylo Samoluk, said the strike occurred in the middle of the night. “I was on my sofa and suddenly my sofa just jumped in the air,” he said.
