2014年2～11月，伊朗与六国就伊核问题最终协议举行了10轮外交谈判，双方共识不断增加，但在焦点问题上分歧难以弥合，谈判最终期限两次被延长。美国和伊朗都需要一份全面协议，“伊斯兰国”的威胁和国际油价暴跌推动双方做出重大让步，谈判各方也相向而行。2015年4月2日，伊朗与六国在瑞士洛桑达成解决伊核问题的框架性方案，受到国际社会普遍欢迎。同时，美伊对方案中一些关键概念的解读大相径庭，从而引发争议和质疑。尽管6月30日前达成最终协议仍有很多困难，但实现伊核问题和解已势不可当。
From February to November，2014，Iran and the “5+1” countries held as many as 10 rounds of negotiations for reaching a final agreement on Iran’s nuclear issue. Though more common grounds were achieved by the parties concerned，a big gap remained on some focal issues，which twice caused the deadline of the negotiations to be extended. Both Iran and the U.S. are in need of a comprehensive agreement，the facts that threats from ISIS remain and oil price continues to plummet make both sides render great concessions，and all parties of the negotiation are jointly moving in the same direction. On April 2，2015，a framework agreement was reached between Iran and the “5+1” countries in Lausanne，Switzerland，which won wide applause among the international society，meanwhile contradictory interpretations of some key concepts of the agreement by Iran and the U.S. caused disputes and doubts. Many obstacles remain before a final agreement can be signed prior to June 30，however，a peaceful resolution of Iran’s nuclear issue is the general trend and popular feeling.
