We have had horrendous trouble with Russian spammers on this site. Eventually, I banned the use of all ".ru" email addresses. I also had to switch to Admin Authorisation, and that stopped them. But I monitor the web traffic on my web site every day, and this is what the last seven days looks like:
https://www.facebook.com/photo.php?fbid ... =3&theater
Note the Russian. LOL. There have been some very serious students of late from France, Italy, Nigeria, South Africa, Australia and even Colombia.
hugs
Geoff