Iran is reviewing "concrete proposals" from mediators that could shape the future of its nuclear program, signaling a potential breakthrough in stalled U.S.-Iran ceasefire diplomacy. Five officials familiar with the negotiations told The New York Times that Qatar has conducted intensive mediation over the past week, holding two rounds of talks in Tehran and hosting a third round in Doha. U.S. Vice President Vance has emerged as a key supporter of Qatar-led efforts to prevent further escalation of conflict. Iran's Foreign Ministry has not commented on the ongoing discussions.