President Trump should authorize cyber retaliation in response to Russia’s latest cyberoffensive against the United States. To tolerate what Vladimir Putin’s spies have just done would be to encourage their new acts of aggression. Moscow’s latest affront is serious.

As reported by Reuters, Russia manipulated software updates from the SolarWinds cybersecurity company’s Orion program. Introducing malware into the software, Russia covertly enabled SolarWinds to do its spying work for it. The intrusion is believed to have begun between March and June of this year.