Russian Novaya Gazeta nr 1 guy said last week directly that this is new modi operandi for FSB. They catched some time ago 1 female journalist, who was sent to spy on them, because they are considered opposition newspaper. She told them a lot of interesting things. She was sent by by trolls' company security unit. Those units are in Russia manned by former security services guys.

Interview in Russian http://tvrain.ru/articles/lobkov_dmi...lpake_-369529/