Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_3 like Mac OS X; en-gb) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5)
AppleCare is international in general, and it usually doesnt matter where you buy it. However, there are a few local exceptions. I found a list of T&Cs for around the world (below), I'd check the most common countries you visit.
http://www.apple.com/legal/applecare/appgeos.html
As I said, you should be fine usually, but it's worth double checking using the link above.