During the meeting, the two sides discussed the cooperation between Tehran and the IAEA and also the agency chief's upcoming visit to Iran.   Referring to the importance of continued cooperation between Iran and the IAEA, Grossi underlined the necessity of creating a positive and constructive atmosphere by all sides.   They also exchanged views over the latest developments surrounding Iran's peaceful nuclear program.   Iran's ambassador to the agency said the IAEA must adopt an independent, technical and impartial role.   Najafi also outlined Iran's approach to its cooperation with the Agency and voiced hope that the upcoming visit of Gross to Tehran will help strengthen cooperation between the two sides