"We have declared our commitment to continuing the path of dialogue and diplomacy, and we have demonstrated our full readiness to participate in several rounds of negotiations," Foreign Ministry spokesman Esmail Baqaei said.
The spokesman added that Tehran is flexible regarding the timing of the talks and is awaiting details regarding the next round of negotiations with the United States from the Sultanate of Oman, which is mediating between the two sides.
"What concerns us is the behavior and positions of the American negotiating team," Baghaei said, adding that contradictory statements by American officials "are not helpful" and will not affect Tehran's resolve to defend its core positions, including its right to enrich uranium domestically.
"Many of the contentious issues can be resolved if the United States is sincere in its sole demand that the Islamic Republic not possess nuclear weapons," Baghaei said on Monday.
He added that Tehran is also prepared to set a new date for a round of nuclear talks with Britain, France, and Germany, after a scheduled round in Italy on May 2 with the European Troika was postponed.
The spokesman said they are awaiting a statement from the Sultanate of Oman regarding the future of negotiations between Tehran and Washington, as the host country for the talks between the two sides.
He stated that his country does not have a direct relationship with the United States, and that "the Omanis are the ones coordinating the timing and location of the talks, and we are informed of this through them."
Commenting on US Secretary of State Marco Rubio's statement that non-nuclear-weapon states do not enrich uranium, and therefore Iran should halt enrichment and import enriched uranium to meet the needs of its civilian nuclear program, Baghaei said that many countries, including close US allies such as the Netherlands and Japan, have peaceful nuclear programs that include enrichment, but refuse to possess nuclear weapons.
He added, "What the US Secretary of State put forward is extremely misleading, but we passed that stage long ago."
He stressed that "the decision of a state party to the Treaty on the Non-Proliferation of Nuclear Weapons to possess a peaceful nuclear program is a legitimate decision, and this right is reserved for it."
Since April 12, three rounds of indirect talks have been held in Oman and Italy between Washington and Tehran to discuss reaching a new agreement on the Iranian nuclear issue.
The upcoming round of negotiations is the fourth high-level meeting between the two countries. These negotiations come after Trump, during his first presidential term (2017-2021), withdrew from the 2018 nuclear agreement, which stipulated the easing of international sanctions on Iran in exchange for restrictions on its nuclear program.
Tehran adhered to the agreement for a full year after Trump's withdrawal, before gradually rolling back its commitments. Trump described the agreement at the time as "bad" because it was not permanent and did not address Iran's ballistic missile program, among other issues.
As a result, he reimposed US sanctions as part of the "maximum pressure" campaign aimed at forcing Iran to negotiate a new, expanded agreement.