The Obama administration responded to Russia’s cyber operations against Democratic National Committee officials last week. The punitive measures seek to deter Russia, and other adversaries, from cyber-related interference with U.S. elections. This strategy connects to the importance President Obama placed on deterrence in cybersecurity. His administration tried to strengthen cyber defenses (deterrence by denial), clarify international law’s application in cyberspace and develop international cyber norms (deterrence by norms), and threaten punishment for hostile cyber operations (deterrence by punishment). However, the election hacking episode highlights how the president’s efforts to achieve deterrence for cybersecurity have failed.