For social media sites like Facebook, 2019 is turning into the year of the history lesson. This is all about the resurgence of Cold War era media campaigns that Russia used to wage internationally using pre-Internet media. In the last few months alone Facebook has announced the discovery and banishment of hundreds of accounts owned and operated by Russian firms that specialize in this sort of thing. The largest Russian disinformation operation is the IRA (Internet Research Agency). During the Cold War something like the IRA would be a top-secret subsidiary of the KGB (secret police).
In the Cold War, those on the left often picked up the Soviet propaganda and amplified it.
In my view, in addition to historical amnesia, Democrats today are simply shocked that the Russians employed propaganda against a Democrat rather than the Republicans who were usually the targets.
Also, don't forget the Chinese, who are a rising (for now) and not a faltering power.