Edit: The astroturf was obvious in the Swedish language. Very shortly: People with very bad Swedish started posting pro Putin comments, some obviously using G Translate. They were unable to discuss certain things -- like that international democracy indexes class Russia as autocratic. (They'd probably be fired.) There were systematic down votes (10-100 down votes in a minute probably going through a bot net, so web admins couldn't automatically detect it). This spamming with very, very unusual opinions were systematically half of all comments on those web sites I read. (After a few months the Swedish of the posts got better, some halfway to idiomatic.)
Edit 2: Sprint, maybe. But not in the same volume in Swedish and not with that amount of fake votes.