Yeah I wanted to mention Euromaidan and Russia increasing its general hostile activity on the internet (overstated in the wake of the 2016 election? Yes. Literally something that verifiably happened with eg various Facebook groups for divisive political issues run by Russians acting on behalf of their government? Also yes). I do think Euromaidan was partially the root cause as it woke Russia up to the possibility that the internet could be used to destabilize its various client states as in Euromaidan or its rivals like the US.
But a lot of people will debate the actual overall influence of that vs it being a scapegoat used to delegitimize the right wing surge at the time; undeniably even if the right wing surge/political divisiveness trend was aided by Russian activity, it was still real people who engaged with it online and voted for the right wing causes.
