关于谈判内容，美伊仍有很大分歧

Core Viewpoint - Iran is set to hold nuclear negotiations with the United States in Muscat, Oman, on June 6, with key disagreements centered around the scope of discussions, particularly regarding Iran's ballistic missile program [1][6]. Group 1: Negotiation Dynamics - Iran insists that the negotiations should focus solely on nuclear issues, while U.S. Secretary of State Rubio emphasizes that discussions must also include Iran's ballistic missile program [1][6]. - An Iranian official stated that the missile program is "not on the negotiation table," indicating a firm stance on the matter [3][8]. - Iran is willing to show flexibility on uranium enrichment for peaceful purposes, contrasting with U.S. demands that include a prohibition on nuclear weapons development, uranium enrichment, and possession of enriched uranium [3][8]. Group 2: Military Posture and Threats - Iran's military leadership has indicated that they have enhanced their deterrent capabilities through comprehensive upgrades to their ballistic missile technology [3][8]. - Following the recent conflict with Israel, Iran's military doctrine has shifted from a defensive to an offensive posture, with threats of severe retaliation against adversaries [3][9]. - The U.S. has been increasing military presence around Iran and issuing threats, urging Iran to engage in negotiations and reach an agreement [3][8].