To me it's very clear that Russia runs campaigns aimed at creating division by amplifying whatever radical voices they can. That includes Brexit, Trump and likely the far right in many other places.

It's not a mastermind plan, it's about weakening those countries by dividing its people and making their inefficiencies bigger and bigger. They're not creating the divide, or radicals from far right, or Nazis/fascists, but they're making it big enough that it's a big deal.