Exactly How Stupid of an Idea Is a U.S.-Russia Cybersecurity Unit?

Josephine Wolff wrote for the Slate Future Tense blog on the ill-advised idea of creating a joint U.S.-Russia cybersecurity unit:

A cybersecurity partnership with Russia would inevitably make the United States weaker. It would make our computer systems weaker by providing information and access about our network infrastructure. It would make our definition of cybercrime weaker by forcing us to collude with a country that harbors some of the most reprehensible cybercriminals in the world. It would make our defensive posture weaker by signaling to other countries that they are free to do what they like to U.S. computers. After all, the only consequences they are likely to face are invitations to please come help us protect ourselves.