Russian media control/influence certainly is pretty worrying. From what I gather its around 1/3rd of the US that are pretty much blanketed by "conservative" media. Be it from Fox News, Sinclair or Talk Radio etc and "conservative" in America may as well be Kremlin TV nowadays.
Look up how OAN started, rich American spends time in Moscow, comes back with Russian wife 30 years his junior and a couple years later starts a media network dedicated to attacking US democracy, this has become a successful network... There is a similar story for the man behind the main Brexit campaign, Aaron Banks.
Murdoch is the main problem, god only knows just how aligned he is with Putin and what his motives really are but his actions speak for themselves, he is a Russian asset.
Then people like Robert Mercer, the money behind Trumps original campaign, Richard Bannon, Breightbart, parler, most other alt-right media around the world, Cambridge Analytica, etc. He runs the highest performing hedge fund in America, protected by financial secrecy laws and suspected of being Putin's personal money laundering scheme.