Iran has rejected allowing restricted inspections at its military sites as part of any future deal over its disputed nuclear programme.
"Any kind of inspection of Iran's military sites, including managed and restricted access, is unacceptable," Brig. Gen. Massoud Jazayeri, Deputy Chief of Staff of the Iranian Armed Forces, said on Friday.
The comments were the latest in a series of statements made by Iranian officials in the countdown to a June 30 deadline.
On Thursday, top Iranian negotiator Abbas Araghchi said "Controlled and managed access [to the military sites] does not mean inspection,” after arriving in Vienna for new round of nuclear talks with the P5+1 countries, namely Britain, China, France, Russia, the United States and Germany.
In similar remarks, Iran’s Supreme leader Ayatollah Sayyed Ali Khamenei, who has the final say for Iran on any deal, ruled out on May 20 any "extraordinary supervision measures" over nuclear activities and said military sites could not be inspected.
Iran reached a tentative deal on April 2 with the P5+1 countries to allow UN inspectors to carry out more inspections under an "Additional Protocol" to the Non-Proliferation Treaty.
Western countries have long claimed that Iran is building a nuclear bomb. Tehran says its nuclear programme is peaceful and has purely civilian aims.