• If you're a private company, then you have no obligations; however, if you have stock holders, you are obligated to maximize the amount of money that you earn. Wouldn't it be a fair statement to say if it's not illegal, then it's okay otherwise there would be a law against it. For example, there are embargoes on some countries like Cuba, Iran, Lebanon, Libya, North Korea, Somalia, and Yemen. There are others and you can see the entire list here:

    http://www.pmddtc.state.gov/embargoed_countries/index.html