Thank you for letting us know about this issue. We do allow players from Russia to register accounts on our website, but as you've mentioned, the option did not appear in the drop-down menu when registering.
We have notified our IT department, which is currently working on it. At the time this reply was posted it was nearing completion, so I can assure you we will have it up and running as soon as possible.
We can't wait to see you back online, and keep in mind we offer 24/7 support on livechat, don't hesitate to contact us, no matter what the issue, we are at your full disposal.
The Thebes Casino team