Try this neat tool,
http://incredibill.me/htaccess-block-country-ips
I have read in some places though that doing this through .htaccess can slow the site down.
Or you can try by blocking the country code.
Code:
SetEnvIf CF-IPCountry CN BuzzOff=1
SetEnvIf CF-IPCountry RU BuzzOff=1
SetEnvIf CF-IPCountry IN BuzzOff=1
Order allow,deny
Allow from all
Deny from env=BuzzOff
In this example, notice "CN", "RU" and "IN" in the first three lines. These stand for China, Russia and India. Edit those to suit your needs (and add or remove as many lines as you like) by consulting the
list of internet country abbreviations.