"The Russians are storming, consolidating in the centre of Severodonetsk, while continuing to destroy infrastructure and industrial facilities," Lugansk region governor Sergiy Gaiday wrote on Telegram early Wednesday.
One of the industrial hubs on Russia's path to taking the eastern Lugansk region, Severodonetsk has become a target of massive Russian firepower since the failed attempt to capture Kyiv.
The Russians now control most of the destroyed city, according to regional authorities.
But in a boost for the outgunned Ukrainian military, Biden has confirmed that more US weaponry is on the way.
A US official told reporters the weapons being sent are Himars, or the High Mobility Artillery Rocket System, which have precision-guided munitions and a longer range than those currently deployed by Ukraine.
The Himars are the centre piece of a $700-million package being unveiled on Wednesday that includes air surveillance radar, more Javelin short-range anti-tank rockets, artillery ammunition, helicopters, vehicles and spare parts, the official said.
The US is attempting to help Kyiv's war effort while not being seen as a direct belligerent, and the official stressed that while the weapons would be used to "repel Russian advances on Ukrainian territory", they would not be "used against Russia".
While some analysts have suggested the Himars could be a "game-changer", others say they should not be expected to suddenly turn the tables for Ukrainian forces struggling under Russian artillery fire.
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