A competitor in my niche is having footer links from 1k+ Russian sites homepages and inner pages with pages PR4 to 6 (even inner pages with PR 4+). They are ranking well in my niche based on these spam links. I am looking for some help on identifying the source for such high PR links from these Russian sites. Is there any blog network or other stuff that is not known to English speaking masses. Help would be appreciated if anybody knows this stuff already. I can share a link or 2 of those sites if anybody is having a clue (serious people only). These aren't open to comments or accept links in any other way on their site.