Apple provides long list of countries to sell your apps over 150 countries, however you cannot sell apps in few embargoed countries by us, cuba, Iran, north korea, syria, sudan. you can gain access to more information at
https://developer.apple.com/internationalization/ http://www.umresearch.umd.edu/ORAA/export_control_guidance/docs/Embargoed%20Countries.pdf
Hope this helps.