News of Iran’s upcoming release of U.S. nationals and the unfreezing of Iranian assets has stirred speculation of a new nuclear deal. But there are many obstacles to such a breakthrough.

Iran's president visited Latin America and the Caribbean, but the countries he did not visit are more significant than those he did. 

Arab world pro-democracy movements raise questions about how much Islam will figure into the political calculus in emerging governments in Tunisia and Egypt, as well as new ones that might arise else…