BBC:
Last year was the deadliest for Russian forces since the start of the full-scale war in Ukraine: at least 45,287 people were killed.
This is almost three times more than in the first year of the invasion and significantly exceeds the losses of 2023, when the longest and deadliest battle of the war was taking place in Bakhmut.
At the start of the war, losses happened in waves during battles for key locations, but 2024 saw a month-on-month increase in the death toll as the front line slowly edged forward, enabling us to establish that Russia lost at least 27 lives for every kilometre of Ukrainian territory captured.
The BBC Russian Service, in collaboration with independent media outlet Mediazona and a team of volunteers, has processed open source data from Russian cemeteries, military memorials and obituaries.
So far, we have identified the names of 106,745 Russian soldiers killed during the full-scale invasion of Ukraine.
The true number is clearly much higher. Military experts estimate our number may cover between 45% and 65% of deaths, which would mean 164,223 to 237,211 people.
