The International Atomic Energy Agency (IAEA) also said in its report released on May 26 that Tehran should provide more information on its work.
Despite such language, a senior Iranian official last week said the report by the Vienna-based U.N. agency again showed that Tehran's nuclear programme was peaceful.
But Iran's Foreign Ministry spokesman on Sunday said Iran had expected more from the IAEA and that it could have submitted a "better report" had it not been for the continuing pressures of one or two known countries, without naming them.
Spokesman Mohammad Ali Hosseini added: "At any rate, the trend of cooperation ... should continue in a way that, as Dr Larijani pointed out, the (Iranian) parliament and the Islamic Republic of Iran would not be compelled to review the going trend of the cooperation and adopt new limitations."
He was referring to Iran's former chief nuclear negotiator Ali Larijani, who on Wednesday said the current levels of cooperating with the IAEA were in jeopardy if major powers continued to kick around Iran's disputed nuclear case.
Earlier on Sunday in Singapore, French Defence Minister Herve Morin said Iran should open its nuclear installations to international scrutiny to clear suspicions about its ambitions.
"We support calls that Iran demonstrates through total opening of its installations that Iran is not conducting nuclear programme with military purposes and goals," he said.
The IAEA has been pressing Tehran to provide answers to Western intelligence accusations that it covertly studied how to design atomic bombs.
"Our activities are fully peaceful and the supposed studies are completely baseless," Hosseini said.
Güncelleme Tarihi: 01 Haziran 2008, 16:31