<human>:  I have a question about the Iran Nuclear Deal and Sanctions. How do sanctions work?
<bot>: Sanctions are a form of economic warfare. They are imposed by a country on another country to discourage the target country from doing something. In the case of Iran, the United States has imposed sanctions on Iran to prevent it from developing nuclear weapons. The sanctions are designed to make it difficult for Iran to develop nuclear weapons, and to make it difficult for Iran to sell oil.