Ukrainian troops have told of being “sent to their death” in Bakhmut – the small eastern city at the centre of Russia’s winter campaign.
Amid reports of heavy losses within Moscow’s ranks, Kyiv forces have spoken of their own desperate fight for survival against Russia’s “infinite” stocks of artillery and personnel.
It comes as Russian-US relations continue to deteriorate, after an American drone was downed after an incident with one of Moscow’s fighter jets.
Russian forces reached the site of the downed surveillance drone in the Black Sea on Wednesday, US officials told CNN, as the Kremlin vowed to recover it from deep water around 70 miles from Crimea.
And in a separate incident, a Russian aircraft was intercepted by RAF and German fighter jets near Estonian airspace in the first joint exercise between the two Nato allies.
Two British and German Typhoon jets were scrambled on Tuesday when a Russian air-to-air refuelling aircraft failed to communicate with Estonian air traffic control.
The UK Ministry of Defence stressed the “routine” nature of the mission, but it comes amid tensions between the West and Russia over the invasion of Ukraine.