Liberal democracy in eastern Europe is not succumbing to a new challenge. It is confronted with a recurrent challenge that has been brewing, surfacing, and re-surfacing since 1989.
PiS is a radical right party professing a nationalist-conservative ideology, but implementing social-economic policies that borrow from social democratic ideas.
If there were no Russian "influence operations" in the virtual world, no disinformation campaign spearheaded by Russian bots and trolls, would the western world look much different today?