Asked about possible cooperation in Iraq, President Hassan Rouhani's chief of staff Mohammad Nahavandian told reporters in Oslo that the nuclear talks were a "test for confidence building".
"If that comes to a final resolution, then there might be opportunities for other issues to be discussed."
Nahavandian added that he was opposed to external intervention against Islamic militants from the Islamic State in Iraq and the Levant (ISIL) who have made sweeping gains in northern Iraq in recent days amid reports of the summary execution of hundreds of US-trained Iraqi soldiers.
"The outside world should just respond to what the government of Iraq wants (and) should not intervene in the management of the situation."
He reiterated a previous Iranian commitment to respond to any request for help from the Iraqi government "to take care of the internal issue" and criticised US inaction.
"With regards to the United States, we have not seen any serious action from them against this wave of terrorism inside Iraq.
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