"I've had nightmares that make more sense than this."
The lack of Russian ethnicity in the cast not only works well dramatically (as funny as it would be to hear Buscemi's Russian accent), but also thematically. It serves as a reflection on the current state of the West, that we are not that much different today with the distrust, narratives, biases, and fake news seemingly permeating all controversial political and social issues. It's a warning against mob mentality. It also happens to be bitingly funny.