The problem is the US doesn't have any jurisdiction over Russia, and the Russian government turns a blind eye to these activities (and sometimes works with certain cybercriminals) as long as Russian citizens aren't victimized. Not only will they not extradite, they won't do anything at all to address it. So another government would have to resort to extralegal methods like what ostensibly happened in this case, if it isn't a smokescreen. (I think either scenario is plausible.)
(This isn't some anti-Russian screed or anything; this is just one particular point where the Russian government is IMO behaving improperly. I could elaborate if needed.)