There are trolls in these comments sections (and others), but they aren't Russian:
The USA has "by far" the world's largest cyber-army, and contracts corporations who set up and pay people to post in social media "around the world" using multiple "using fake online personas to influence internet conversations and spread pro-American propaganda"
"Centcom's contract requires for each controller the provision of one "virtual private server" located in the United States and others appearing to be outside the US to give the impression the fake personas are real people located in different parts of the world."
USA propagandists use multiple fake personas, each.
https://www.theguardian.com/technology/2011/mar/17/us-spy-operation-social-networks
https://www.theguardian.com/commentisfree/cifamerica/2011/mar/17/us-internet-morals-clumsy-spammer
http://www.reuters.com/article/us-election-intelligence-commentary-idUSKCN10F1H5
http://www.businessinsider.com/ndaa-legalizes-propaganda-2012-5