I have this problem: [webmasterworld.com...] and I decided to solve it by going on my cpanel account and deny all ips, that visited my website, from Russia and Ukraine. Now I have a doubt: Is there a chance I banned the Russian googlebot ip? Or is googlebot ip only from USA? Probably this is a stupid question and I became paranoid about any update on my website that could hurt Google.
The official Googlebot is based in California according to Google. The human raters however may be anywhere on the planet so blocking an entire country might cause a few of them to give your page a *did not load* rating. I imagine that if your site gathers enough of those it might impact your rankings, only Google knows for sure.