The report also said that Iran failed to cooperate with the IAEA high-ranking delegation who had visited Tehran twice recently.

Zibakalam said the way to solve Iran's long-standing nuclear dispute should follow a "constructive" step-by-step procedure.

"It is a step-by-step (process). Iran moves one step. The G5+1 moves one step. Then, Iran will take another step," said the university professor.

The Iranian expert warned against any move which may lead to the failure of the talks, saying that "if the U.S., during the negotiations, starts demanding things which Iran finds...not logical, then the negotiations won't get anywhere."

Zibakalam further said he doubts if anything substantial will happen before the U.S. presidential election, "because if Obama takes any step for reconciliation with Tehran, his Republican opponents will criticise him, will tell him that ...you are too soft on Iran."

Regarding Israel's military threats on Iran's nuclear sites, Zibakalam said he believes Israel is not bluffing, because Israel fears a nuclear Iran will pose an existential threat to it.

In the past months, some senior Israeli leaders have been saying that Israel may launch an attack on Iran's nuclear facilities without informing the U.S. if it feels Tehran is close enough to acquiring a nuclear weapon.

The Iranian expert said that there are two schools of thoughts about Israel with regard to Iran's nuclear program.

The first one is that some analysts believe Israel, by heightening rhetoric of military attack on Iran, wants to pressurize the western countries and other world powers into agreeing to slap harsher sanctions on Tehran, said Zibakalam.