Russian President Vladimir Putin on Monday declared victory in the eastern Ukrainian region of Luhansk, one day after Ukrainian forces withdrew from their last remaining bulwark of resistance in the province. Russia’s defence minister Sergei Shoigu reported to Putin in a televised meeting on Monday that Russian forces had taken control of Luhansk, which together with the neighbouring Donetsk province makes up Ukraine’s industrial heartland of Donbas.

Shoigu told Putin that “the operation” was completed on Sunday after Russian troops overran the city of Lysychansk, the last stronghold of Ukrainian forces in Luhansk. Putin, in turn, said that the military units “that took part in active hostilities and achieved success, victory” in Luhansk, “should rest, increase their combat capabilities.”

Putin’s declaration came as Russian forces tried to press their offensive deeper into eastern Ukraine after the Ukrainian military confirmed that its forces had withdrawn from Lysychansk on Sunday. Luhansk governor Serhii Haidai said on Monday that Ukrainian forces had retreated from the city to avoid being surrounded.

“There was a risk of Lysychansk encirclement,” Haidai said, adding that Ukrainian troops could have held on for a few more weeks but would have potentially paid too high a price. “We managed to make a centralised withdrawal and evacuate all injured,” Haidai said.

“We took back all the equipment, so from this point, withdrawal was organised well.”