You can at your level block website referrer from Russia and China, add this to htaccess :
# Block zombie traffic (you can add other countries, added lines must be with [NC,OR], last line must be only with [NC])
RewriteCond %{HTTP_REFERER} \.ru [NC,OR]
RewriteCond %{HTTP_REFERER} \.cn [NC]
RewriteRule .* - [F]