Henry Farrell explains why Trump’s exciting new plan to team up with Russia to battle The Cyber is not all that practical.

First he points out that some co-operation even with rivals can work, as an Obama agreement with China has largely worked.

But.

As Trump has described his discussions with Putin, both want something much more far-reaching than the deal that Obama reached with China. Instead of setting up dialogue, Trump wants to engage in true cooperation. He wants to set up a joint “unit” that would handle election security issues so as to prevent hacking. This unit would, furthermore, be “impenetrable.”

It’s not hugely difficult to spot the flaw in that plan.

If the proposed cybersecurity unit were to work effectively, the United States would need to share extensive information with Russia on how U.S. officials defend elections against foreign tampering. The problem is, however, that information that is valuable for defending U.S. systems is, almost by definition, information that is valuable for attacking them, too. This is one reason U.S. officials have not previously proposed any far-reaching arrangement with Russia on cybersecurity. Providing such information would almost certainly give the Russians a map of vulnerabilities and insecurities in the system that they could then exploit for their own purposes.

It would not only provide the fox with a map of the henhouse, but give him the security code, the backdoor key, and a wheelbarrow to make off with the carcasses. U.S. officials have determined that Russian hackers have probed U.S. election systems, presumably to discover vulnerabilities that they could exploit. Although there is no evidence that Russia actually manipulated machines to alter the vote in the 2016 election, there is excellent reason to believe that Russia has carefully considered the pros and cons of direct intervention, as well as the hacking and leaking that it did engage in.

And we don’t actually want to help them do that even more.

But hey, look at it from Trump’s point of view. His ratings are in the toilet, so he’ll need extra help if he runs in 2020 (frankly I’m hoping he’ll be removed long before then). Maybe if he gives the Russians the security code and the key they’ll help him get re-elected.

Furthermore, when Trump says that this unit would be “impenetrable,” he implies that Russia and the United States would cooperate on making it secure against outside hacking by third parties. Again, such cooperation is wildly unlikely to work well. To make it work, the United States would have to share sensitive methods with Russia, as well as vice versa. Neither side is going to want to do this, because again it would provide potential adversaries with a deep understanding of protective measures, which might allow those adversaries to penetrate them.

In short, the kind of cooperation that Trump is proposing would be very hard to accomplish between close allies with deeply shared security interests (the United States shares a lot of secrets with select allies — but it does not share everything, for the same reasons that they do not share their deepest defensive secrets with the United States). It is more or less impossible to carry off with a state that not only is often an adversary but has recently demonstrated its desire to hack U.S. elections, if only it could get away with it.

Wouldn’t you think Trump could have figured this out for himself? Even as clouded and confused as he is?