They pose as citizens of European, African, Asian or American countries online and try to steer discussion to subvert the local society. The Twitter location reveal showcases that it has an immense scale.
There are many examples such as Scottish independence movement going offline when iran goes offline.
On websites like HN and reddit you cannot even see where someone is originating from. But you can ALWAYS detect them by the cognitive biases they're using to drive their propaganda: false equivalency biase, false choice dilemmas, and so on.
Yes, and there are more Russians than Ukrainians, yet somehow they can't overcome a smaller country in 4 years. Trolls want you to give up in countering them. Their work is about pushing propaganda AND demoralising people so that they give up fighting. When you think "why bother", they won.