article_snippet: The operation has highlighted the role played by neighboring Iran in the fight against ISIS, at a time when the United States and five other world powers are negotiating with Tehran on a controversial deal to curb Tehran nuclear program.
article_snippet: Iran has provided advisers, weapons and ammunition to the Iraqi government.
article_snippet: According to the Pentagon, there may be Iranians operating heavy artillery and rocket launchers as well.
article_snippet: How the U.S. and Iran found common interests .