President Vladimir Putin says Russian troops will push further into Ukraine to build on their success on the battlefield after the fall of the town of Avdiivka where he says Ukrainian troops had been forced to flee in chaos.
The town, which once had a population of 32,000, fell to Russia on Saturday, Putin's biggest battlefield victory since Moscow captured the city of Bakhmut in May 2023.
Television footage released by Russia's defence ministry showed that almost every house in Avdiivka had been branded with war.
Putin said on Tuesday that the Ukrainian order to withdraw from the town had been announced after Ukrainian troops had already begun to flee in chaos.
He said that all captured Ukrainian troops should be accorded their rights under international conventions on prisoners.
"As for the overall situation in Avdiivka, this is an absolute success, I congratulate you. It needs to be built on," Putin told Defence Minister Sergei Shoigu in the Kremlin.
"But that development must be well-prepared, provided with personnel, weapons, equipment, and ammunition," Putin said.
"It seems to be self-evident but nevertheless I draw your attention to it."
Ukraine said it withdrew its soldiers to save them from being fully surrounded after months of fierce fighting.
The Ukrainian military said there had been casualties but that the situation had stabilised somewhat after the retreat.
Both sides accused each other of suffering huge losses.
After the failure of Ukraine to pierce Russian lines last year, Russian forces have been trying to grind down Ukraine's army just as officials in Kyiv ponder a major new mobilisation.
Ukrainian President Volodymyr Zelenskiy appointed a new commander last week to run the war.
Putin sent tens of thousands of troops into Ukraine in February 2022, triggering full-scale war after eight years of conflict in eastern Ukraine between Ukrainian forces on one side and pro-Russian Ukrainians and Russian proxies on the other.
Avdiivka, which is called Avdeyevka by Russians, has endured a decade of conflict.
It holds particular symbolism for Russia as it was briefly taken in 2014 by Moscow-backed separatists who seized a swathe of eastern Ukraine but was then recaptured by Ukrainian troops who built extensive fortifications.
Avdiivka sits in the industrial Donbas region, 15km north of the Russian-controlled Ukrainian city of Donetsk.
Before the war, its Soviet-era coke plant was one of Europe's biggest.
Shoigu said Russian forces had also taken control of the village of Krynky in Ukraine's southern Kherson region.
Ukraine's southern military command said its troops had held their positions on the left bank of River Dnipro and said Russian attacks were unsuccessful.
Neither side gives death tolls for the war.
