Ukrainian troops holding out in the ruins of Severodonetsk reportedly came under renewed heavy assault on Wednesday from Russian forces who see the capture of the industrial city as key to control of the surrounding Luhansk region.

In southern Ukraine, authorities warned that Russian attacks on agricultural sites including warehouses were compounding a global food crisis that has stirred concerns of famine in some developing countries.

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It is reported that Russian armed forces have been focused for weeks now on seizing Severodonetsk, which was home to some 106,000 people before Moscow invaded Ukraine on February 24.

“Fighting is still raging and no one is going to give up the city, even if our military has to step back to stronger positions. This will not mean someone is giving up the city – no one will give up anything. But (they) may be forced to pull back,” Serhiy Gaidai told Ukrainian television.

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Russian forces will further increase their shelling and bombardment of both Severodonetsk and its smaller twin city of Lysychansk on the west bank of the Siverskyi Donets River, he said.

Luhansk and the adjacent province of Donetsk form the Donbas, claimed by Moscow for Russian-speaking separatists who have held eastern parts of the region since 2014.

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“The absolutely heroic defence of Donbas is ongoing,” Ukrainian President Volodymyr Zelensky said in a video statement on Tuesday.

Moscow says it is engaged in a “special military operation” to disarm and “denazify” its neighbour.