When Reddit’s year end recaps were released — which give statistics on activity for individual subreddits such as top posts and comments — they indicated Russia was the third most common country of origin for users visiting many of these [small subreddits for Albertan towns], causing moderators to rethink what was behind the trolling activity they had contended with a few months before.

I don't think there's any question about the interference campaign existing. At this point the question is about influence. How effective are these trolls?

And what was the second country, and why isn't that a problem?