Recently we have noticed a increasing amount of internet traffic coming from Russia and other countries to our Australian websites. Most, if not all will be hackers/robots trying to hack into the sites.
Apart from the risk of having a site taken over these attacks can slow the site down and cause other issues.
For sites which only want local traffic eg from Australia we have implemented a verification step before we get website hits from overseas. This has reduced traffic by 50% on some of our websites as well as reducing the rick of having sites compromised.