Spammers are not always Asian. Considering Americans love to use Spambots. (Check google for evidence, lol)
I just became a mod at another board, and a lot of the spammers they have to deal with come from China. At one point, they wanted to just block all IP addresses from China -- they didn't say they were going to block addresses from anywhere else in the world. Don't know why they didn't stick with it.
Just recently, we had a couple of spammers who didn't post yet had links to unknown places (I wasn't going to click on the links; are you crazy?). No English characters. Just accented letters. Pretty awkward.