Looking at current ratio of Russian and Ukrainian losses, having three times the soldiers is not going to be enough.
Still a lot, esp. you consider the primary draftable age groups (e.g. 18-30), and that not all males in that group would be military worthy, i.e. medical or mental disabilities, etc.
Also a big deal if you consider that most of them are the wealthier, smarter, more mobile parts of the population, which will exacerbate the brain-drain and impact the economy. A lot of those guys aren't gonna go back anytime soon, or at all.
This a post-Covid era. Everything that is "smart and mobile" is also remote. Which means that physical relocation doesn't exactly imply brain drain, especially given that wealthier destinations such as the US or some parts of Europe are harder to reach then ever.