Ukrainian President Volodymyr Zelensky has made an impassioned plea to Western allies to speed arms deliveries and help stem “terrifying” casualties as Russian forces lay siege to the eastern city of Severodonetsk, destroying the last bridges into the industrial hub.

It is reported that the cities of Severodonetsk and Lysychansk have been targeted for weeks as the last areas in the eastern Donbas region of Lugansk still under Ukrainian control.

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On Monday, President Volodymyr Zelensky said the human cost of the battle for the region was “simply terrifying”.

Zelensky expressed confidence in Ukraine’s ability to reclaim territory, calling on the nation’s allies to send more weapons.

“We just need enough weapons to ensure all of this. Our partners have them.”

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On Monday, Presidential advisor Mikhaylo Podolyak listed items he said the Ukrainian army requires, including hundreds of howitzers, tanks and armoured vehicles.

“Being straightforward — to end the war we need heavy weapons,” he tweeted.

Regional governor Sergiy Gaiday has said that Ukraine’s forces had been pushed back from Severodonetsk’s centre after a weeks-long Russian offensive.

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“They destroyed all the bridges, and getting into the city is no longer possible. Evacuation is also not possible,” he told Radio Free Europe.

He said Russian forces control 70 to 80 percent of the city but had not captured or encircled it.

Last week, Ukraine’s defence minister said up to 100 of his troops were dying daily and 500 sustaining injuries. Previously, Zelensky had estimated 60-100 Ukrainian soldiers were dying daily.

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With the screws tightening on the Lugansk region, Ukrainian forces have two choices: “to surrender or die”, said Eduard Basurin, a representative for pro-Russian separatists.