A European-sponsored International Atomic Energy Agency (IAEA) resolution passed in September that paved the way to reporting Iran to the Security Council over its nuclear program "in our view has jeopardized the positive atmosphere existing between both parties," Iran's representative to the agency Mehdi Akhondzadeh said.

"Any action from interlocutors to further complicate the situation could have unpredictable consequences," he cautioned, speaking at a seminar in Helsinki.