Generally speaking, studies show that Russia often tried to inflame debates that were already in the news. It tried to polarize debates about religion, particularly in the United States, about ethnic groups, and about the government. It tried to sow division.
I think we have to think about places where information might slip in. That would be one way of identifying it and then being able to combat it. We have to ask ourselves what debates can inflame a situation and divide people, and what type of debate foreign powers can interfere in.