Ukrainian troops have withdrawn from the devastated eastern town of Avdiivka, Ukraine's new army chief has said, paving the way for Russia's biggest advance since May last year when it captured the city of Bakhmut.
The withdrawal, announced as Ukraine faces acute shortages of ammunition with US military aid delayed for months in Congress, aimed to save troops from being fully surrounded by Russian forces after months of fierce fighting, Kyiv said.
General Oleksandr Syrskyi, who took the helm of the Ukrainian military in a major shakeup last week, said Ukrainian forces had moved back to more secure positions outside the town that had a pre-war population of 32,000.
"I decided to withdraw our units from the town and move to defence from more favourable lines in order to avoid encirclement and preserve the lives and health of servicemen," he was quoted as saying in an armed forces statement.
The loss of the town nearly two years into Russia's full-scale invasion gave Ukrainian President Volodymyr Zelensky a stronger case to make to the West for more urgent military aid.
Speaking at the Munich Security Conference, he warned that his country's battle to repel Russian troops was being held back by a lack of long-range weapons and artillery shells.
"Keeping Ukraine in the artificial deficits of weapons, particularly in deficit of artillery and long-range capabilities, allows Putin to adapt to the current intensity of the war," he said.
US President Joe Biden had said on Thursday that Avdiivka risked falling to Russian forces because of ammunition shortages following months of Republican congressional opposition to a new US military aid package for Kyiv.
Capturing Avdiivka is key to Russia's aim of securing full control of the two provinces that make up the industrial Donbas region and could provide Russian President Vladimir Putin a battlefield victory as he seeks re-election next month.
Avdiivka has borne the brunt of mounting offensive pressure by Russian forces in the east as wavering Western military aid has compounded the fatigue of troops fighting for almost two years.
"We are taking measures to stabilise the situation and maintain our positions," Mr Syrskyi said.
There was no immediate comment about the withdrawal from the Russian Defence Ministry, Mr Zelensky or the Ukrainian defence minister.
Russia stepped up its offensive on Avdiivka in October last year and Ukraine's positions had been looking increasingly fraught for weeks.
The Third Assault Brigade, a prominent Ukrainian infantry assault unit, was deployed in the town to help reinforce troops this week as other Ukrainian forces pulled back from the southeast of the town.
The unit described the fighting as "hell" and said on social media that Ukrainian defenders had been outnumbered by Russian forces by a ratio of about six to 100 in some places.
Russia has not given details of its losses in the fighting for the town, but Ukrainian officials and Western military analysts say its advances have come at a high cost in terms of personnel and armoured vehicles.
The town, where fewer than 1,000 residents remain, lies just north of the Russian-held bastion of Donetsk which Ukraine lost control of in 2014 when Moscow's proxies began an uprising.
Avdiivka also has a vast coking plant that stopped functioning during the war.
