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Illustration: Rebecca Zisser/Axios 

For the past month, Axios has been interviewing people trusted with the nation’s most sensitive secrets. We wanted to know, in this time of acute geopolitical stress, which global threat worried them most, and which threats they thought weren’t getting the attention they deserved.

When we asked America’s foremost intelligence experts what keeps them up at night, one response came up over and over again: the risk of a crippling cyberattack.

The big picture: Homeland Security Secretary Kirstjen Nielsen said this week that the U.S. is in "crisis mode," comparing the danger of a massive attack to a Category 5 hurricane looming on the horizon. Intelligence chiefs from the last three administrations agree, and told Axios there is no graver threat to the United States.

A well-executed cyberattack could knock out the electrical grid and shut off power to a huge swath of the country, or compromise vital government or financial data and leave us unsure what is real.

  • The sheer number of internet-connected devices, from cars to pacemakers, means the risks are growing by the day.
  • Gen. David Petraeus, former CIA director: “What worries me most is a cyber equivalent of a weapon of mass destruction falling into the hands of extremists who would, needless to say, be very difficult to deter, given their willingness to blow themselves up on the battlefield to take us with them.”
  • Former CIA Director Leon Panetta says the biggest threat is "a cyberattack that could paralyze the nation," while former Homeland Security Secretary Michael Chertoff says "cyberattacks on critical infrastructure from state or state-sponsored actors are the biggest threat right now.”

Russia, China, Iran and North Korea are the top U.S. adversaries in the cyber realm, but the threat extends to non-state actors and criminal groups.

  • “The steady drumbeat of breaches in the headlines — each more fantastic than the next — may have numbed people, but everyone should care about the cyber threat," explains Lisa Monaco, homeland security adviser to Barack Obama. "First, we are all vulnerable. Second, it won’t take a cyber 9/11 to make this very real.”

“There will be tremendous media coverage and assigning of blame after there is a catastrophic attack on U.S. critical infrastructure that results in the loss of American lives,” says Frances Townsend, homeland security adviser to George W. Bush, “but we need to spend more time now covering what is at stake and the magnitude of the growing risk.”

  • "Companies in the energy, financial, and other key economic sectors need to develop the capacity to share threat information in real time, and give the government the visibility and information to take action when necessary to defend us," says Matt Olsen, former director of the National Counterterrorism Center.

The bottom line: The fact that so many intelligence experts have reached the same conclusion — and feel so strongly about it — shows how much the dangers to the United States have changed since 9/11.

  • Sign up here for Axios World Editor David Lawler's twice-weekly newsletter breaking down the biggest global stories and why they matter.

Worthy of your time:

Go deeper

20 mins ago - Technology

New skill for Olympic athletes: cybersecurity

Illustration: Shoshana Gordon/Axios

When Olympic athletes from all over the world land in Beijing for the 2022 Olympic Games, they'll be loaded up with burner phones and will likely leave their own devices behind.

Why it matters: Athletes are headed to the Beijing Olympics with mixed guidance from their home countries about whether their personal information will be safe online and their devices will be secure.

Omicron is finally burning out

Expand chart
Data: N.Y. Times; Cartogram: Kavya Beheraj/Axios

New COVID infections are declining in the U.S. — a sign that the Omicron wave has likely peaked.

Yes, but: Deaths are rising, and the U.S. still has a lot of COVID — a reminder that even this milder variant is still a very real threat to unvaccinated Americans.

Activist Republicans oppose helping Ukraine

Ground personnel unload weapons, including Javelin anti-tank missiles, and other military hardware delivered on a National Airlines plane by U.S. military at Boryspil Airport near Kyiv on Jan. 25, 2022. (Photo: Sean Gallup/Getty Images)

Republicans running in high-profile primary races aren't racing to defend Ukraine against a possible Russian invasion. They're settling on a different line of attack: Blame Biden, not Putin.

Why this matters: GOP operatives working in 2022 primary races tell Axios they worry they'll alienate their base if they push to commit American resources or troops to help Ukraine fight Russia.