php - htaccess 301按国家/地区重定向

I would like to redirect one link to another and by country redirect to another one.

The "redirector" is like http://url.com/redirector and I would like to redirect it to an external domain such as http://example.com/url but for the USA I would like to redirect it to http://example2.com/url

How would I be able to do that with the htaccess? Right now I'm using that:

redirect 301 /redirector http://example.com/url

I don't care about SEO because this page doesn't need to