Even if President Donald Trump is able to reach an agreement with Kim Jong Un, with North Korea promising to freeze or even dismantle its nuclear program, there will always be uncertainty about possible cheating.

Just ask Israel—which, despite having one of the world’s most competent and aggressive intelligence services, the Mossad—nearly missed the fact that North Korea was helping build a nuclear reactor in next-door Syria, a country long viewed by Israel as a dangerous threat.

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The American CIA missed it, too, and now, 11 years after Israeli air force jets bombed the clandestine Syrian facility, Israel’s military censor is finally lifting the veil of secrecy and permitting locally based reporters to publish interviews with participants in the operation for the first time. We spoke with dozens of former cabinet ministers, including Prime Minister Ehud Olmert, as well as military and intelligence chiefs and commanders and even some of the pilots who took part in the operation. The codename for the Sept. 6, 2007, raid, conducted near the remote desert city of Deir ez-Zur: “Outside the Box.” Before today, Israel has never officially acknowledged its existence.

Years later, Israeli spooks are still raising bitter questions about the CIA’s intelligence failure. Former Mossad director Tamir Pardo asked in an interview with us: “Where were the Americans? North Korea is a highly important target for them. And it still isn’t clear whether [Syrian President Bashar] Assad was running the nuclear project, or was it the North Koreans?” The former spy chief added that he has some doubts that Syria was going to keep the plutonium, or perhaps it was going to be shipped to North Korea as a supply of which the West would be unaware. “This is a resounding failure by the Americans,” Pardo said.

Pardo’s questions raise another: If one of the best intelligence communities in the world, and certainly the most formidable in the Middle East, could be fooled by North Koreans and Syrians, what might the CIA be missing? That could be true in Korea, in Iran, or almost anywhere on Earth.

The Israeli air force raid on a secluded, unmarked building in northeastern Syria took place—a few minutes after midnight between 5th and 6th of September. To attack deep in enemy territory is easy, but Israel’s American-made F-15 and F-16 jets enjoyed protection by sophisticated electronic jamming that blinded Syria’s air defenses, and they had no trouble dropping tons of explosives on the target and confirming visually that it had been flattened. (Photos, many provided by Israeli intelligence, were released by the CIA to Congress – and immediately leaked to the media in Washington.)

The Syrian facility was almost identical to the Yongbyon nuclear complex in North Korea that produced plutonium for nuclear bombs, according to Israeli intelligence officials, and it was only weeks away from beginning to produce highly radioactive materials.

Deir ez-Zur, the largest city in eastern Syria, would be captured in 2014 by ISIS forces and then held by the Islamic militants for more than three years. Just imagine if ISIS had gotten its hands on plutonium and other parts designed to construct nuclear bombs. Israel’s action – a difficult decision by then-Prime Minister Olmert, after he unsuccessfully asked President George W. Bush to bomb the building –prevented the world’s most bloodthirsty terrorists from acquiring the world’s most lethal weapons.

Israeli ministers and officials are proud of it. Olmert, who later resigned amid accusations of corruption, which eventually after being indicted by a court landed him in prison for 18 months, told us it was one of his most important and difficult decisions. Even his nemesis, then defense minister Ehud Barak, said in an interview: “Olmert deserve full credit for the brazen decision.”

Lifting the veil of secrecy also reveals an ego battle for credit between Israel’s two largest intelligence agencies. “The exposure of the reactor is one of the great achievements of Military Intelligence [the agency known by its Hebrew acronym, Aman] in particular, and of Israeli intelligence in general,” said Brig. Gen. Shalom Dror, who in 2007 was a major in charge of Aman’s research on Syria. Yet Pardo, who was deputy director of the Mossad at the time (and from 2011 through 2015 the spy agency’s chief), differs: “For years, Syria built a nuclear reactor under our noses, and we did not know about it for years. It was not built on the dark side of the moon, but in a neighboring country where we always thought we know almost everything.”

Israel’s highest ranking general at the time, Chief of Staff Lt. Gen. Gabi Ashkenazi, recalled receiving reports on many Arab countries from Aman and the Mossad, but none linked the words “Syria” and “nuclear” in any serious way. “Sure, suspicions arose, but there was no proof,” continued Ashkenazi, who has since retired. “And in intelligence work there were a lot of suspicions. Syrian nuclear was not a subject considered to be important.”

Ram Ben-Barak, senior man in the Mossad for many years who was then head of one of its operations, told us: “Anyone who says that he knew that Syria was building a nuclear reactor either doesn’t know or isn’t telling the truth. When we brought the information, it was a complete surprise. Until then, the assessment was maybe yes, maybe no—that perhaps they were planning a nuclear project by the route of enriching uranium, and perhaps a reactor to produce plutonium. In short, we didn’t know at all what to look for.”

The fact that there was any attention paid to the possibility of a secret Syrian program at all was the result of a trauma suffered by Israeli intelligence near the end of 2003. Libya’s dictator, the late Col. Muammar Gaddafi, publicly admitted that he had a nuclear weapons program. Western governments quickly discovered that the knowhow and materials had been sold to the Libyans by Abdul Qadeer Khan, the so-called father of Pakistan’s nuclear bomb, who later became a freelancer and made a fortune as a nuclear trafficker.

Israel’s spy chiefs winced as they admitted they had made an error comparable to the 1973 war, when the Jewish state was taken by surprise by its neighbor’s armies on Yom Kippur. Israeli intelligence had not completely ignored A.Q. Khan. They had strong evidence that he helped Iran launch its military, unacknowledged, nuclear ambitions. But they did not realize that his sales efforts had succeeded elsewhere.

Shabtai Shavit, who was the director of the Mossad in the 1990s, told us a few years ago that Israeli intelligence knew about Khan’s travels in the Middle East – hawking his wares – but did not understand how the Pakistani engineer could provide a quick and relatively easy kit for starting the route toward a nuclear arsenal. “If we had understood, I would have recommended that he be assassinated,” Shavit said, “and that would have been one of the few times that eliminating a person could have changed history.”

After the revelation that Gaddafi’s Libya was dangerously advanced in its nuclear work, Israel’s military intelligence chiefs ordered that every scrap of evidence that had been collected – but filed away without much analysis – be looked at again. Aman found reports of Khan’s visits to Saudi Arabia, Egypt and Syria. Because the first two countries were friends of the United States, it seemed highly unlikely they would pursue nuclear weapons. The agency doubled its focus on Syria, where President Bashar Assad had come to power in 2000 by default when his father died – because his elder brother, groomed for leadership, had perished in a car crash.

Israeli intelligence saw the new dictator, who had been working as an ophthalmologist in London, as having a borderline personality—an inexperienced man who could be tempted to act recklessly or adventurously. Because his aspirations could be lethal and he sat on Israel’s northeastern border, Aman commanders decided not to underestimate Assad.

“I had to explain to my people why I insisted on concerning ourselves with Syria,” said a research head in the agency, retired Brig. Gen. Eli Ben-Meir, because the top topics at that time had been Iran and its proxy force in Lebanon, Hezbollah. Israel fought a war against the Lebanese Shiite militia in the summer of 2006 that was notably frightening due to the constant rain of rockets from Lebanon that compelled almost a million Israelis to descend to shelters or move temporarily to southern Israel.

Ben-Meir told us there were clues in Israel’s deep and constant monitoring of Syria. Ships arrived from Asia with no apparent purpose. Trucks moved toward the east. Israel’s intelligence liaisons asked friendly services, including the CIA, if they had noticed anything of a nuclear nature in Syria. The answer was negative.

Pardo’s boss at the time, Meir Dagan (who was director of the Mossad from 2002 to 2011 and died two years ago) joined Chief of Staff Ashkenazi in asking Prime Minister Ariel Sharon for an extra budget specifically to look for a nuclear project in Syria. Aman’s renowned Unit 8200 greatly increased its monitoring of all Syrian communications.

Ibrahim Othman, director of Syria’s Atomic Energy Commission, was considered to be the man who had to know the secrets. He became a high-priority target for Israeli intelligence.

As reported elsewhere, Israel Mossad’s operatives broke into rooms where he stayed in Europe, including an apartment Othman maintained in Vienna, Austria, near the headquarters of the International Atomic Energy Agency—and found a gold mine. Othman had left a digital device and all its data was sucked out and sent to Israeli intelligence laboratories.

Surprisingly, because no one believed any vital information had been obtained, deciphering it was not a priority. The data was waiting on the laboratory’s shelves a few days until it was finally deciphered. “My intelligence officer entered my room,” recalls Ben Barak, “and showed me the photos taken from the phone.” He added, smiling, “Sometimes intelligence operations need luck.”

The photos from Othman’s device showed him in the company of some North Korean scientists and most importantly were shot inside the structure, which clearly revealed that it was a nuclear reactor to produce plutonium.

The photos were the “smoking gun”—the ultimate evidence to corroborate Israel’s suspicions. The information was rushed to Prime Minister Olmert, who approached U.S. President George W. Bush to ask him if the U.S. would do something about it. Bush said no, explaining that U.S. forces were fully engaged in Iraq and Afghanistan and that he didn’t want to open a third front. Nevertheless, Bush didn’t say anything about an Israeli raid. For Olmert, that was all he needed. He interpreted Bush’s silence as a green light and instructed Lt.-General Ashkenazi to prepare an air strike.

After the raid, Israel kept silent—and so did Assad. Syria didn’t want to admit it had violated its international commitments. Israel, for its part, figured out that if it said nothing in public, Assad would swallow his pride and not retaliate. Privately, Israeli leaders and chiefs of the military and intelligence contacted or met their allies in the West—the U.S., UK, France, Germany—and in the Arab world (Egypt and Jordan) to share with them the information behind the raid. Olmert also personally called Russian leader Vladimir Putin. Israel’s calculation that Syria would not strike back proved correct, and the world seemed relieved that someone had removed a potentially serious threat to peace.

But to remove Iran’s or North Korean nuclear threats will be a much more difficult task if President Trump decides to exercise the much-trumpeted military option.

Yossi Melman is an intelligence and defense analyst for Maariv and other Israeli media, and a co-author of “Spies Against Armageddon: Inside Israel’s Secret Wars.”

Dan Raviv of i24News is a co-author of “Spies Against Armageddon: Inside Israel’s Secret Wars.”