In March, the White House announced new sanctions being placed on Russia as a result of a number of malicious cyber warfare efforts directed at the United States. Among these efforts were the commonly discussed election meddling that dominates most political discourse regarding Russia in American politics today, but an arguably far greater threat was also discussed in both Trump’s and the Treasury’s documents regarding these sanctions: the fact that Russia had successfully infiltrated America’s power grid.

“The Administration is confronting and countering malign Russian cyber activity, including their attempted interference in U.S. elections, destructive cyber-attacks, and intrusions targeting critical infrastructure,” said Treasury Secretary Steven T. Mnuchin in a release at the time. The statement went on to provide a laundry list of methods of tactics employed by the Russians, including on site and open-source reconnaissance and complex network based efforts. However, much of their success still came from e-mail manipulation and “phishing” schemes, aimed at gaining access to networks by compromising people, rather than the secure systems themselves.

The result, according to the American government, was the successful infiltration of multiple infrastructure systems, including the commercial energy grid, though the Treasury went on to claim that any Russian access has since been terminated.

“We were able to identify where they were located within those business systems and remove them from those business systems,” one official said, speaking on condition of anonymity.

The threat foreign control over the American power grid could pose to the nation’s populous is difficult to overstate. In fact, experts have estimated that as much as 90% of the American population would die within two years following a nationwide electromagnetic pulse attack knocking out the power. America relies on power for much more than comfort — everything from agriculture to medicine requires power for every step of production and delivery — and all of it would be gone.

In such an apocalyptic scenario, many Americans would look to the nation’s defense apparatus for help. The military, trained to conduct operations in austere environments, would almost certainly be able to maintain functionality in a blackout thanks to assets hardened against such an attack and internal power production capabilities — at least your average American would assume. In fact, America’s military installations, law enforcement and intelligence apparatus is almost entirely reliant on commercially sourced external power, just like the rest of us.

That means a Russian attack that included shutting down America’s power grid would also mean shutting down the vast majority of America’s defensive capabilities.

A ten year old report filed by the Pentagon’s Defense Science Board said at the time, “military installations are almost completely dependent on a fragile and vulnerable commercial power grid, placing critical military and homeland defense missions at unacceptable risk of extended outage.”