I think about this often. In many countries, MDs from the US can get great jobs, but might not actually be licensed practitioners. This is the case here in Turkey--I know an American guy who works for the big Hopkins-affiliated hospital here but is technically not an attending. I think he's seen as a consultant or something. Basically I think he is there for marketing purposes more than anything else (the Turkish physicians at this particular hospital don't really need 'consultation' as many of them did residencies/fellowships in the states at pretty prestigious programs). He does get paid well though, has great hours and gets to travel.
If you want to practice, the situation is going to vary depending on the country. I'm really interested in coming back and working in this area of the world, both Turkey and more needy areas--but you have to pass a Turkish proficiency exam to get licensed in Turkey (fortunately I've passed that level already). You are also going to need some knowledge of the healthcare system, but from my experience in different healthcare systems both in Turkey and Iraq this knowledge is really not that hard to pick up.
I don't know specifics on Scandinavian countries but I imagine you are going to have a much harder time finding work there. Most countries want to hire their own people if they are well trained. The knowledge of the healthcare system is probably not going to be your biggest obstacle--language, licensing, and competing with native citizens for jobs will be.
But in places that have more serious shortages of physicians ("third world"), as well as in places with developing medical infrastructure, some portion of well-off citizens and/or medical tourism (big cities in Turkey, UAE, Qatar, Caribbean, some S. American countries, etc) you could probably find a pretty good job. Again, even if you can find a job in these places whether or not you are actually going to practice is going to be country-specific and depend on things like language and possibly even citizenship.
If you are really interested in this you can find some pretty sweet gigs in the world of international medicine--but they're probably not going to be in western Europe.