Unless you can show some form of residency you cannot buy from another country's store. The question on cross store purchasing is asked frequently so I'll just quote the most complete answer (courtesy of Dave Sawyer) from the many given:
In order to buy from any given country's iTunes Music Store, you must have either:
a) a credit card with a billing address in that country, or
b) a mailing address in that country
and a gift certificate or a prepaid card that was bought in that country.
If you cannot fulfill one of these two sets of conditions, you will not be able to purchase from any given country's iTMS.
.......this is due to restrictions placed on Apple by the record companies and other rights holders (who are often completely different from country to country and so all require their own individual negotiations and contracts), not by Apple's choice. And this also applies to all the legal download stores that carry major-label content,
not just the iTMS.