A divided and weakened EU is the biggest priority of Putin’s Russia after reconstituting the USSR.

Brexit and other forms of dissension spread in Europe by Russian agents (from bombings in Berlin to poisoning dissidents in London) are definitely deliberate and war by other means, not some sort of sideshow. Separatist movements have and will be used to weaken enemies and figures like Farage and Orban are still doing Russia’s work.

I would not be at all surprised to find that dissent/separatism in countries opposed to Russia is funded by Putin. Dissent and chaos are an important part of the Russian playbook, not an afterthought.