I discovered a url linking to my site this morning and was shocked to find someone registered my same domain name under a ".ru" extension. This person is mirroring the content on my site! He is only feeding in the homepage though, all the links in the navigation link back to my ".com" site. He is also linking the images from my site to his .ru.
My question is can this hurt our ranking with Google? Should I be concerned? What can I do about it?
Thanks for your help,