Iran but not with the United States, and not with Israel—a state which Iran's government has derecognized since the 1979 Revolution. Among Muslim nations, Iran has severe relationship with Saudi Arabia due to different political and Islamic ideologies while Iran is a Shia Islamic Republic and Saudi is a conservative Sunni monarchy. Regarding the Israeli–Palestinian conflict, the government of Iran has recognized Jerusalem as the capital of the State of Palestine, after Trump recognized Jerusalem as the capital of Israel. On 14 July 2015, Tehran and the P5+1 came to a historic agreement ("Joint Comprehensive Plan of Action") to end economic
Name of Iran "Persia" and "Iran" could officially be used interchangeably. However the issue is still debated today. The name "Irān" is first attested in the Avesta as "airyānąm" (the text of which is composed in Avestan, an old Iranian language spoken in northeastern Greater Iran, or in what are now Turkmenistan and Tajikistan). The Modern Persian word "Īrān" () derives immediately from Middle Persian "Ērān" (Pahlavi spelling: "ʼyrʼn"), first attested in an inscription that accompanies the investiture relief of the first Sassanid king Ardashir I at Naqsh-e Rustam. In this inscription, the king's Middle Persian appellation is "ardašīr šāhān šāh ērān" while