If you go to the Apple Store, click on AppleCare (on the left side), and select any plan, there's a link to a "Terms and Conditions" PDF. It says, " This Plan is offered and valid only in the 50 United States, the District of Columbia, Canada, Brazil, and Mexico. This Plan is not valid in any other country or U.S. territory. This Plan is not available for Florida consumers or where prohibited by law."
So, that would lead me to assume that you must buy an AppleCare plan specific to your country/region.