“Continued external threats and putting Iran under the conditions of a military attack could lead to deterrent measures like the expulsion of inspectors and ceasing cooperation with it,” Ali Shamkhani wrote in a post published on the social media platform X, formerly known as Twitter, on Thursday.

“Transferring enriched material to safe and undisclosed locations in Iran could also be on the agenda,” he continued.

The remarks come as US President Donald Trump has again warned of military action if Tehran does not agree to a deal with Washington over its civilian nuclear program.

In comments in a meeting with a group of media and cultural activists in Algeria on Tuesday night, Iranian Foreign Minister Abbas Araghchi said the only subject to be mooted at the upcoming negotiations with the US in Oman is the nuclear issue and assurances about the peaceful nature of Iran’s atomic activities.

“The nuclear topic, which means making transparency and giving assurances about the peaceful nature of Iran’s nuclear program in exchange for the removal of the cruel sanctions, will be the only topic of the talks,” he said, outlining the agenda of the indirect talks on Saturday.

Araghchi noted that the upcoming negotiations in Muscat will give diplomacy a new opportunity, calling them "a test to gauge the seriousness of the United States, which has a long history of non-commitment and unilateralism".

Russia has welcomed the prospect of negotiations aimed at replacing the 2015 nuclear accord, which Trump unilaterally abandoned in 2018.

“We know that certain contacts — direct and indirect — are planned in Oman. And, of course, this can only be welcomed because it can lead to de-escalation of tensions around Iran,” the Kremlin's spokesman Dmitry Peskov said, adding that Moscow “absolutely” supports the initiative.

China also urged the US to “stop its wrong practice of using force to exert extreme pressure,” after Trump threatened Iran with bombing if it failed to agree to a deal.

“As the country that unilaterally withdrew from the comprehensive agreement on the Iran nuclear issue and caused the current situation, the United States should demonstrate political sincerity and mutual respect,” Chinese foreign ministry spokesman Lin Jian said.