Oman and its leader , Sultan Qaboos bin Said al Said , were praised for its key role in the talks by diplomats and leaders from both Iran and the P5 + 1 .
Oman : Oman welcomed the agreement .
Oman and Oman 's leader , Sultan Qaboos bin Said al Said , were praised for its key role in the talks by diplomats and leaders from both Iran and the P5 + 1 .
Oman : Oman welcomed the agreement .