yeah, Russia seems to keep coming up as a country that has a lot of nefarious actors on the internet, which is unfortunate, because I get good number of comments from fans in Russia on my Youtube channel. There could be some legit fans in your pile of Russian submissions, it's possible a small number of them are legit....but Oh well, that's the world we live in and looks like a lot of effort just to 'clean up' the registration process, so some might get lost.
For those who don't know, 'bots' appear to register on a daily basis, Miguel has to put up obstacles for 'bot' accounts because often they will come in and post ads or possibly dangerous links. If not maintained on a regular basis, unfortunately, they start piling up
Speaking of 'nefarious actors' on the Internet, Twitter has been warning of spam/phishing 'Google Doc" attack currently going on right now. If you get an invite to view a google doc in an email, don't click on it until you confirm that the 'sender' did indeed send you the email..... I'm reading that if you click or open it, it might download something, then send itself to those in your address book