Article from the Wall Street Journal: Russia Has Lost Almost 90% of Its Prewar Army, U.S. Intelligence Says. Paywalled. (December 12, 2023)
Related (Free) article from CNN: Russia has lost 87% of troops it had prior to start of Ukraine war, according to US intelligence assessment. (December 12, 2023)
Related (Free) article from Reuters: U.S. intelligence assesses Ukraine war has cost Russia 315,000 casualties -source. (December 12, 2023)