Right after releasing of the report concerning Iran's nuclear program by International Atomic Energy Agency' chief, Mr. Yukiya Amano, the global pressures have started ratcheting up against the country. However, as always, Tehran officials have strongly rejected the report and blamed IAEA chief as follower of Israel and the United States. Here is something that should be noticed.

Islamic Republic, years ago, joined the Nuclear Non-Proliferation Treaty (NPT) according to which the IAEA appointed delegates can any time visit its nuclear sites to ensure that the country does not have military intentions. According to NPT, IAEA has the authority to visit any nuclear sites across the country, but on condition to inform the given country before the visit.
But, in order to show their sincerity, sometimes Tehran also welcomed random visits to its nuclear sites.

But even with such steps, Iran's nuclear program has remained covered with veil of suspicions. Why?

There are many things fuelling suspicion and tossing dusts over the program's transparency. The first factor is the question regarding the nuclear enrichment program, "Why is Tehran ready to pay a high cost for it while it can easily buy enriched uranium from allies like Russia in cheaper rate to use for the so-called peaceful purposes of electricity, medical and etc?"
Moreover, it has large natural resources and is not in need of other energy resources. It can easily use its natural resources to provide it with necessary energy deficits, if ever exists.

Secondly, there were secret nuclear sites which were just recently revealed. So, if Tehran officials are not really following a nuclear military project, why they resort to measures which further spark global suspicion.
In addition, the fact which has further dominated the program is provocative steps of Tehran of ignoring global calls to withhold or postpone the program in order to provide further transparency.

These are factors combined with aggressive foreign policy as security officials frequently hold military drills and use belligerent tone against Israel, US and their allies. Even President Mahmoud Ahmadinejad once said that Israel should be removed from the global map as well as insistently has rejected the Holocaust.

As result, negotiations have ended to nothing and the ruling "warfare condition" moves toward a military option. Tel Aviv officials more than ever highlights a military strike as viewing that diplomatic efforts would not stop Tehran's nuclear program. Likewise, Tehran political and military officials more than ever alarms Israel and its allies of committing mistake and striking the country, saying that start of war maybe in the hand of Tel Aviv and its allies but it would be Iran that determines the end of it.