That's probably going to be a bit of a whackamole game because if you get EuroDNS as their ISP to turn off their server, they'll just move to a new host.

What you might do is also contact the registrar, in this case it's RIPN, at www.nic.ru and explain the situation.

Some registrars, like GoDaddy, will revoke the registration for the domain name if it is being used for illegal activities, but that will depend on the particular TOS for RIPN.