Same for other people. The country you wanted to flee away to from the repressive regime and economic decline now denies visas? Now you have to look for other opportunities. I suspect people who tend to leave Russia aren't pro-putin and have decent education and sought after skills, not sure what forcing them to stay achieves.

The EU should have some sort ot free citizenship offer to defecting Russian soldiers.

Russia might have more weapons but keeping 100k troops feed in what is going to increasingly hostile areas is no simple thing.