美伊关键谈判举行，和平的最后机会？

Group 1 - The core focus of the negotiations between Iran and the U.S. is the nuclear issue, with the third round of indirect talks taking place in Geneva, Switzerland, on the 26th [3] - Both parties have expressed positive signals prior to the negotiations, with Iran stating that "an agreement is within reach" and U.S. officials expressing hope for the talks [4] - The U.S. has introduced a "hard requirement" for any future nuclear agreement, demanding that Iran accept an "indefinite" validity without sunset clauses, contrasting with the 2015 nuclear deal which included sunset provisions [4][5] Group 2 - Iran is expected to make concessions on its nuclear program, potentially reducing its uranium enrichment levels and stockpiles, and may propose a joint venture for civilian uranium enrichment with international oversight [5] - Analysts suggest that the current military buildup by the U.S. in the region, including the deployment of two aircraft carriers, adds pressure to the negotiations and indicates a critical juncture for both sides [6] - The outcome of the negotiations may hinge on three factors: U.S. domestic considerations regarding military action, Iran's resolve against perceived aggression, and the influence of Israel in the negotiations [7][8]