Yes, that's the Nokia warranty policy: the country/region in which the device was planned to be sold (revealed by product code) is the country/region where you have warranty.
That is why I'm trying to find a shop here in the USA, which sells European N9s (i.e. with European product code). But even if I do find one, I'm not quite sure that Nokia Europe would honor the warranty if I don't have a valid European sales receipt or warranty certificate.
So, if anyone has any experience or information about this, please let me know.