article_snippet: There are several difficult issues still remaining,"‎ State Department spokeswoman Marie Harf said.
article_snippet: We have had long discussions on this, but there are issues that are related to sanctions that are still under consideration,Ba'idinejad Ba'idinejad said.
article_snippet: Ba'idinejad added that is not the only issue that needs to be worked out.
article_snippet: That's why it's taken so long to even get to this point, and why what's happening in Lausanne matters.
article_snippet: "There still remain some difficult issues," the top U.S. diplomat said.
article_snippet: More important are three points that have dominated the talks in Lausanne: .
article_snippet: Agreement on those points is crucial, a Western diplomat said.