https://meduza.io/en/news/2023/02/13/mediazona-and-bbc-news-russian-publish-further-figures-on-russia-s-losses-in-ukraine
Mediazona and BBC News Russian, together with a group of volunteers, have confirmed the deaths of 14,093 Russian servicemen killed in the Ukraine war before February 12. They arrived at this total using only public records and other open sources.
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Compare that to more than 150,000 dead on the Ukrainian side.