theres a wiki page on combat losses which gives a breakdown from multiple sources although it is a little out of date. unfortunately the (reasonably) exact number is probs only really known by Russian AF Command.

The AFU Claimed 409,820 russian losses (180,000 killed) as at feb 2024. with total losses about to pass 550,000 as of yesterday

Figures from other sources have more conservative figures though. see the wiki