| All of the above are good resources; as darksoul has mentioned mod_geoip is going to be one of your fastest means to redirect, and it loads directly into Apache, so all you need to do is have someone build it, then setup a 'banned countries' configuration for you.
 I have seen stability problems in the past with mod_geoip2 for Apache2, however.  It will need to be loaded absolutely last, and does not play well with specific throttling and other handlers.
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