you can easly block em by Country !
if your are a litte proofed in php this should be no problem !
this i only tipped here not testet !!
function checkVisitor($ip){
$query = @unserialize(file_get_contents('http://ip-api.com/php/'.$ip));
if($query && $query['status'] == 'success') {
if(strpos($query['country'],'Ukraine')!==false) { return true; }
} else { return false;}
}
if you need some help call me
kind regards