By STEPHANIE LIECHTENSTEIN and JON GAMBRELL

VIENNA (AP) — Iran said it has built and will activate a third nuclear enrichment facility, ratcheting up tensions with the U.N. on Thursday immediately after its atomic watchdog agency censured Iran for failing to comply with nonproliferation obligations meant to prevent it from developing a nuclear weapon.

“The Islamic Republic of Iran has no choice but to respond to this political resolution,” the Iranian Foreign Ministry and Atomic Energy Organization said in a joint statement.

The censure by the International Atomic Energy Agency, its first in 20 years over Iranian non-compliance, could set in motion an effort to restore sanctions on Iran later this year.

U.S. President Donald Trump had previously warned that Israel or America could launch airstrikes against Iranian nuclear facilities if negotiators failed to reach a deal on Iran’s rapidly advancing nuclear program. A sixth round of Iran-U.S. talks is scheduled to begin Sunday in Oman, and as tensions simmer some American government staffers deemed nonessential have begun leaving the Gulf region.

Nineteen countries on the IAEA’s board of governors voted for the resolution to censure Iran, according to diplomats who spoke on condition of anonymity to describe the outcome of the closed-doors vote.

The resolution was put forward by France, the United Kingdom, Germany and the U.S. Russia, China and Burkina Faso opposed it, while 11 abstained and two did not vote.

The resolution calls on Iran to provide answers “without delay” in a long-running investigation into traces of uranium found at several locations Tehran has failed to declare as nuclear sites, according to a draft seen by The Associated Press.

Western officials suspect the uranium traces could provide further evidence that Iran had a secret nuclear weapons program until 2003.

Iran lists steps in retaliation for censure

Speaking to Iranian state television after the U.N. agency’s vote, the spokesman for the Atomic Energy Organization of Iran said that his agency immediately informed the IAEA of actions Tehran would take.

“One is the launch of a third secure site” for enrichment, spokesman Behrouz Kamalvandi said. He did not elaborate on the location, but the organization’s chief, Mohammad Eslami, later described the site as “already built, prepared, and located in a secure and invulnerable place.”

Another step would be replacing old centrifuges with advanced ones at an underground site at Fordo. “Our production of enriched materials will significantly increase,” Kamalvandi said.

Iran has two underground sites, at Fordo and Natanz, and it has been building tunnels in the mountains near Natanz since suspected Israeli sabotage attacks targeted that facility.

Iran said other measures were also being planned in response to the U.N. agency’s censure. The IAEA draft resolution said “Iran’s many failures to uphold its obligations since 2019 to provide the Agency with full and timely cooperation regarding undeclared nuclear material and activities at multiple undeclared locations in Iran … constitutes non-compliance with its obligations.”

Under those obligations, which are part of the Nuclear Non-Proliferation Treaty, Iran is legally bound to declare all nuclear material and activities and allow IAEA inspectors to verify that none of it is being diverted from peaceful uses.

The IAEA’s draft resolution hints at reporting Iran to the U.N. Security Council to consider more sanctions, stressing that the global body is the “organ bearing the main responsibility for the maintenance of international peace and security.”

It also said it supports “a diplomatic solution to the problems,” which includes the talks between the U.S. and Iran.

Still a chance for Iran to cooperate with IAEA

A senior Western diplomat last week described the U.N. watchdog resolution as a “serious step,” but added that Western nations are “not closing the door to diplomacy on this issue.” However, if Iran fails to cooperate, an extraordinary IAEA board meeting will likely be held in the summer, during which another resolution could get passed that will refer the issue to the Security Council, the diplomat said on condition of anonymity because he wasn’t authorized to discuss the issue with the media.

France, the U.K. and Germany have repeatedly threatened in the past to reinstate sanctions that were lifted under the 2015 Iran nuclear deal if Iran does not provide “technically credible” answers to the U.N. nuclear watchdog’s questions.

The authority to reestablish those sanctions by the complaint of any member of the original 2015 nuclear deal expires in October. That puts the West on a clock to exert pressure on Tehran over its program before losing that power.

Thursday’s resolution follows the IAEA’s so-called “comprehensive report” that was circulated among member states last weekend. In the report, the U.N. nuclear watchdog said that Iran’s cooperation with the agency has “been less than satisfactory” when it comes to uranium traces discovered by agency inspectors at several locations in Iran.

One of the sites became known publicly in 2018, after Israeli Prime Minister Benjamin Netanyahu revealed it at the United Nations and called it a clandestine nuclear warehouse hidden at a rug-cleaning plant. Iran denied this, but in 2019, IAEA inspectors detected the presence of uranium traces there as well as at two other sites.

Iran’s President Masoud Pezeshkian, who campaigned on reaching out to the West, struck a harder line after the IAEA vote.

“I don’t know how to cooperate with the outside world to stop them from doing evil acts and let the people live independently in this country,” Pezeshkian said. “We will continue down our own path; we will have enrichment.”

The Associated Press receives support for nuclear security coverage from the Carnegie Corporation of New York and Outrider Foundation. The AP is solely responsible for all content.

Additional AP coverage of the nuclear landscape: https://apnews.com/projects/the-new-nuclear-landscape/

Gambrell reported from Dubai, United Arab Emirates. Associated Press writer Amir Vahdat in Tehran, Iran, contributed to this report.