Mortuaries are currently overcrowded with dead bodies, Serhiy Hayday, the head of the military administration of the Luhansk region, has said.
He added that Russia has deployed all its army in the region.
He told CNN that Russia is now throwing all the reserves they have in the region.
Russian forces have suffered a “huge number of losses and wounded, because some troops are being tactically withdrawn to regroup”, Hayday claimed.
“The hospitals are overcrowded and the mortuaries are overcrowded,” he said.
Hayday added that “many warehouses behind enemy lines have been blown up” in the past few days, destroying “a huge amount” of Russia’s ammunition and fuel.
Hayday estimated that 10,000 to 15,000 residents remain in the city of Lysychansk.
Ukraine’s military had on Sunday announced that they were withdrawing from the city.
Russian President, Vladimir Putin had since congratulated his troops for successful operations in the region.