In the past month or so, several on my flist have been friended by Russians. It's a mystery, since the journals are in Cyrillic, and seem to have nothing in common with us.
It turns out, they are spambots after all, mining for names, emails, whatever. You can get all the information here. In short it seems that LJ is finally admitting there is a problem and they will suspend the accounts that are reported. But they can only do that if they know who to suspend; LJ doesn't know if they're not reported.
So, if you've been 'friended' by a Russian user, go to LJ Abuse and file a report.