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IAEA Director General Rafael Grossi speaks at a news conference in Vienna, Austria, on June 9.LISA LEUTNER/Reuters

Iran’s nuclear program is “galloping ahead” and the International Atomic Energy Agency has very limited visibility on what is happening, IAEA chief Rafael Grossi told Spain’s El Pais newspaper in an interview published on Friday.

In June, Iran began removing essentially all the agency’s monitoring equipment, installed under its 2015 nuclear deal with world powers. Mr. Grossi said at the time this could deal a “fatal blow” to chances of reviving the deal after 2018′s pullout by the United States.

“The bottom line is that for almost five weeks I have had very limited visibility, with a nuclear program that is galloping ahead and, therefore, if there is an agreement, it is going to be very difficult for me to reconstruct the puzzle of this whole period of forced blindness,” he told El Pais.

“It is not impossible, but it is going to require a very complex task and perhaps some specific agreements,” said Mr. Grossi, who was visiting Madrid.

Mr. Grossi said in June there was a window of just three to four weeks to restore at least some of the monitoring that was being scrapped before the IAEA lost the ability to piece together Iran’s most important nuclear activities.

Iran has breached many of the deal’s limits on its nuclear activities since then-U.S. president Donald Trump pulled Washington out of the agreement and reimposed sanctions on Tehran in 2018. It is enriching uranium close to weapons-grade.

Western powers warn Iran is getting closer to being able to sprint toward making a nuclear bomb. Iran denies wanting to.

Indirect talks between Iran and the U.S. on reviving the 2015 deal have been stalled since March.

Iran’s Foreign Minister Hossein Amir-Abdollahian was quoted on Friday as saying his country and the U.S. were very close to a deal to revive the 2015 accord, but that Tehran needed U.S. guarantees to avoid getting “bitten twice.”

“We have a ready text in front of us and we agree on more than 95 to 96 per cent of its content, but there’s still an important flaw in this text: we need to get the full economic benefits of the agreement. We don’t want to be bitten twice,” Iranian media quoted Mr. Amir-Abdollahian as saying.

Mr. Grossi said he was concerned and worried about the weeks with no visibility.

“The agency needed to reconstruct a database, without which any agreement will rest on a very fragile basis, because if we don’t know what’s there, how can we determine how much material to export, how many centrifuges to leave unused?” he said.

Asked about a Reuters report that Iran was escalating its uranium enrichment further with the use of advanced machines at its underground Fordow plant, Mr. Grossi said “the technical progress of the Iranian program is steady.”

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