Look at the Ukraine - part of the population identified as Ukrainian, part as Russian, and it lead to a civil war.

Look, this is a live issue. People are dying. People are dying in my hometown. Please don't just repeat things you may have heard "somewhere," because there is an information war, and if you repeat lies, you help perpetuate a bad thing by bad people. I think it is better to either say nothing about that conflict, or try to use local sources only if you really want to talk about it.