"Visiting or Inspection of Iran's centers under any title, including managed access  … will not be acceptable," Jazzayeri said on Friday. 

He reiterated that opinion polls also indicate that a majority of the Iranian people are opposed to the inspection of the country's military sites.

On Thursday Iranian Deputy Foreign Minister and senior negotiator Seyed Abbas Araqchi told the state TV upon arrival at the Vienna airport that "I have explained this many times that there is no difference between inspection and visiting the military and non-military centers, that are, in fact, non-nuclear; we don’t accept such a thing."

"What has been raised within the framework of the Additional Protocol pertains to managed access to these centers," Araqchi underlined.

In relevant remarks in late April, General Jazzayeri underlined that inspection of the country's military sites would be impossible.

"Everyone should know that in our view, visiting the military centers is completely impossible since it is among our redlines and we will not allow anyone to opine on such issues," Jazzayeri said in an interview with Rah-e Dana news website.

He also advised the Iranian negotiators participating in nuclear talks with the world powers to keep vigilant and remain suspicious of the opposite party's intentions.

Also on April 9, Supreme Leader of the Islamic Revolution Ayatollah Seyed Ali Khamenei underlined that Iran doesn’t allow any inspection of its defensive and military centers.

"They (the foreigners) shouldn’t be allowed at all to penetrate into the country's security and defensive boundaries under the pretext of supervision, and the country's military officials are not permitted at all to allow the foreigners to cross these boundaries or stop the country's defensive development under the pretext of supervision and inspection," Ayatollah Khamenei said, addressing a large number of Iranian people in Tehran.