US Cyber Command lets individual Russian operators know that Uncle Sam cares.
The US is reaching out directly to individuals involved in Russian influence operations. US Cyber Command is reported to be direct-messaging election-meddling trolls (New York Times). The message is as simple as it is direct: we know who you are and what you're doing, and you'd be well-advised to stop (Ars Technica). Observers differ as to how effective this will be as a deterrent (Slate), but recent US indictments of individual Russian nationals for their role in influence operations give the warnings some point (Slate). And it's unknown what other retaliatory operations Cyber Command may have under preparation or in progress.