Core Viewpoint - Negotiations between Iran and the United States have commenced in Oman, focusing on nuclear issues and the lifting of sanctions against Iran [1] Group 1: Negotiation Details - The Iranian delegation is led by Foreign Minister Amir-Abdollahian, while the U.S. delegation is headed by Middle East Special Envoy Steve Hanke [1] - The talks are described as indirect negotiations, specifically limited to nuclear matters and sanctions relief [1] Group 2: Context and Background - The U.S. government has recently issued military threats towards Iran and has increased military presence in the region, urging Iran to negotiate and reach an agreement promptly [1] - The negotiations are taking place in Muscat, the capital of Oman, as confirmed by Iranian officials [1]