Below is one source, and I have seen estimates up to a million. Regardless, the loss of manpower is one reason North Korea has been asked to supply soldiers and its why Russia couldn't stop the Kursk invasion.
https://www.iiss.org/online-analysis/military-balance/2025/02/combat-losses-and-manpower-challenges-underscore-the-importance-of-mass-in-ukraine
"Like equipment losses, it is difficult to know the exact number of Russian casualties. However, as of early January 2025, the IISS estimates that a minimum of 172,000 Russian troops have been killed and 611,000 wounded, of which at least 376,000 are severely wounded (disabled), with up to an accumulated 235,000 wounded but recoverable. Russian recruitment, including the forced mobilisation in occupied Donbas, the mobilisation in 2022, and recruiting from the prison system, has generated approximately 976,000 personnel for the war effort. Up to 617,000 – including those recoverable wounded and those undergoing training – are therefore estimated by the IISS to be deployed in or near Ukraine as of late December 2024."
Edited by DC Jayhawk at 09:17:43 on 04/01/25