You can add extra security to your wordpress website by using the mod_security
You can block one or more specific countries to access your website like this:
- download GeoIP database
mkdir /usr/share/geoip/
cd /usr/share/geoip/
wget -N http://geolite.maxmind.com/download/geoip/database/GeoLiteCountry/GeoIP.dat.gz
gzip -df GeoIP.dat.gz
- add rules to mod_security2