They will destroy your site with porn and spam. You should delete them ASAP. I did some work for a site just last week that got hundreds of these freaks (acutally its a robot) registered on his site, within a few hours, his how site was overwhelmed with posts full of porno and viagra spam, hundreds and hundred of posts. I have a script and database table that you can use to check if they are known spammers but if they are .ru email addresses, more likely than not they are spammers, especially if you are running a geographically "local" site.
HTH
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