Barely a day after Ukrainian forces withdrew from their last remaining stronghold of resistance in the eastern Ukrainian region of Luhansk, the President of Russia, Vladimir Putin declared victory in the province.

The development was reported to Putin by Russia’s Defense Minister Sergei Shoigu in a televised meeting Monday, July 4.

Shoigu stated that Russian forces had taken control of Luhansk, which together with the neighboring 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tried to press their offensive deeper into eastern Ukraine after the Ukrainian military confirmed that its forces had withdrawn from Lysychansk on Sunday.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 and killed.

“There was a risk of Lysychansk encirclement,” Haidai told the Associated Press, 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 do centralized withdrawal and evacuate all injured,” Haidai said. “We took back all the equipment, so from this point, withdrawal was organized well.”

Haidai said Russian forces were now focusing their efforts on pushing toward the line of Siversk, Fedorivka, and Bakhmut in the Donetsk region, about half of which is controlled by Russia. The Russian army has also intensified its shelling of the key Ukrainian strongholds of Sloviansk and Kramatorsk, which has a stronger Ukrainian military presence in Donetsk.

On Sunday, six people, including a 9-year-old girl, were killed after Russian bombs shelled Sloviansk and another 19 people were wounded, according to local authorities. Kramatorsk also came under fire on Sunday.

An intelligence briefing Monday from the British Defense Ministry supported the Ukrainian military’s assessment, noting that Russian forces will “now almost certainly” switch to capturing Donetsk totally. The briefing said the conflict in Donbas has been “grinding and attritional,” and is unlikely to change in the coming weeks. Complete control of Luhansk and Donetsk would make Ukraine a landlocked country as Russia will have control of the Black sea parts of Luhansk and Donetsk.

While the Russian army has a massive advantage in firepower, military analysts say that it doesn’t have any significant superiority in the number of troops. That means Moscow lacks resources for quick land gains and can only advance slowly, relying on heavy artillery and rocket barrages to soften Ukrainian defenses.

Putin has made capturing the entire Donbas a key goal in his war in Ukraine, now in its fifth month. Moscow-backed separatists in Donbas have battled Ukrainian forces since 2014 when they declared independence from Kyiv after the Russian annexation of Ukraine’s Crimea. Russia formally recognized the self-proclaimed republics days before its Feb. 24 invasion of Ukraine.

Since failing to take Kyiv and other areas in Ukraine’s northeast early in the war, Russia has focused on Donbas, unleashing fierce shelling and engaging in house-to-house combat that devastated cities in the region.

In his nightly video address, Ukrainian President Volodymyr Zelenskyy vowed that Ukrainian forces will fight their way back to control Luhansk.

“If the command of our army withdraws people from certain points of the front where the enemy has the greatest fire superiority, in particular, this applies to Lysychansk, it means only one thing: We will return thanks to our tactics, thanks to the increase in the supply of modern weapons,” Zelenskyy said.