Well, in fact part of the reason why they left Russia is to be freer from threat of law enforcement. Ukraine is a more corrupt country and also doing shady things is more socially acceptable there. Don't get me wrong, i am a big supporter of Ukraine including its war efforts (and in fact work full time on Ukrainian defence tech project of my own), but it's a country as close to the popular Western mental image of "Eastern Europe" as it gets. Russia is a more orderly place - it is uncanny, but not chaotic. If you have some bitcoin, you can get away from law enforcement in Ukraine for a lot longer than you can in Russia.

And well, the reason of why cybercriminals are so frequently Russians is not that Russians are particularly evil. It's simply because they have the best technical higher education of Eastern Europe. Atheistic, post-Communist cultures of all of those countries, save for Czech Republic maybe, have no backstops against (nonviolent) crime at all. People there won't do cybercrime because they don't have the brains or training to do it, not because they are morally against it or society prevents them from it. It may be difficult to grasp for Americans (even those who don't consider themselves religious), but there are cultures that are completely Godless even on subconscious level. These people do whatever works and whatever they can get away with.