More recently, Iran has been a regular adversary in cyberspace—and while it hasn’t demonstrated quite the acuity of Russia or China, Iran is “good at finding ways to maximize the impact of their capabilities,” says Jeff Greene, the former executive assistant director of cybersecurity at CISA. Iran, in particular, famously was responsible for a series of distributed-denial-of-service attacks on Wall Street institutions that worried financial markets, and its 2012 attack on Saudi Aramco and Qatar’s Rasgas marked some of the earliest destructive infrastructure cyberattacks.

Today, surely, Iran is weighing which of these tools, networks, and operatives it might press into a response—and where, exactly, that response might come. Given its history of terror campaigns and cyberattacks, there’s no reason to think that Iran’s retaliatory options are limited to missiles alone—or even to the Middle East at all.

Which leads to the biggest known unknown of all:

5. How does this end? There’s an apocryphal story about a 1970s conversation between Henry Kissinger and a Chinese leader—it’s told variously as either Mao-Tse Tung or Zhou Enlai. Asked about the legacy of the French revolution, the Chinese leader quipped, “Too soon to tell.” The story almost surely didn’t happen, but it’s useful in speaking to a larger truth particularly in societies as old as the 2,500-year-old Persian empire: History has a long tail.

As much as Trump (and the world) might hope that democracy breaks out in Iran this spring, the CIA’s official assessment in February was that if Khamenei was killed, he would be likely replaced with hardline figures from the Islamic Revolutionary Guard Corps. And indeed, the fact that Iran’s retaliatory strikes against other targets in the Middle East continued throughout Saturday, even after the death of many senior regime officials—including, purportedly, the defense minister—belied the hope that the government was close to collapse.

The post-World War II history of Iran has surely hinged on three moments and its intersections with American foreign policy—the 1953 CIA coup, the 1979 revolution that removed the shah, and now the 2026 US attacks that have killed its supreme leader. In his recent bestselling book King of Kings, on the fall of the shah, longtime foreign correspondent Scott Anderson writes of 1979, “If one were to make a list of that small handful of revolutions that spurred change on a truly global scale in the modern era, that caused a paradigm shift in the way the world works, to the American, French, and Russian Revolutions might be added the Iranian.”

It is hard not to think today that we are living through a moment equally important in ways that we cannot yet fathom or imagine—and that we should be especially wary of any premature celebration or declarations of success given just how far-reaching Iran’s past turmoils have been.

Defense Secretary Pete Hegseth has repeatedly bragged about how he sees the military and Trump administration’s foreign policy as sending a message to America’s adversaries: “F-A-F-O,” playing off the vulgar colloquialism. Now, though, it’s the US doing the “F-A” portion in the skies over Iran—and the long arc of Iran’s history tells us that we’re a long, long way from the “F-O” part where we understand the consequences.

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