I think there is some connection between the Serbian and Russian academic strategists because the Milosevic regime used a similar playbook during the Yugoslav wars in the 90s. Step 1: spend decades encouraging your ethnic group to migrate outward, Step 2: once there is a decently sized minority (or even majority) announce it now belongs to the main country and use your group to stand up a resistance.

The sinister thing is that Step 1. is done very slowly over a long period of time, and can be sold as various pleasant sounding ideas such as "brotherhood and unity," becoming a modern melting pot nation like the USA where everyone is equal, etc.