新一轮美伊谈判将启动，美方要求核协议无限期有效！专家分析

Core Viewpoint - The upcoming third round of indirect negotiations between the U.S. and Iran, scheduled for February 26 in Geneva, will primarily focus on Iran's nuclear program, with expectations for productive discussions despite skepticism about achieving a long-term agreement [1][3]. Group 1: Negotiation Details - The negotiations will be mediated by Oman, with U.S. representatives including Special Envoy Witte and Jared Kushner meeting with Iranian Foreign Minister Zarif to discuss Iran's proposed nuclear agreement [1]. - A key U.S. demand revealed prior to the negotiations is that any future nuclear agreement must be "indefinitely valid" without sunset clauses, requiring Iran to comply with the agreement obligations long-term [1][2]. Group 2: Broader Context and Challenges - Previous rounds of negotiations have shown progress, but significant differences remain, particularly regarding Iran's nuclear capabilities and missile programs, with the U.S. seeking a comprehensive deal that includes these issues, while Iran prefers to focus solely on nuclear discussions [2]. - Experts suggest that regardless of the negotiation outcomes, substantial improvement in U.S.-Iran relations is unlikely, with the potential for ongoing cycles of tension and temporary relief [3].