Ted Mills’s review published on Letterboxd :
Pitch black satire that might surprise those coming from the relatively light Veep...but probably not. This is brutal (and brutally funny) stuff, as the struggle to find a successor to Stalin travels similar territory to Veep and The Thick of It, but with 1000 percent more fear and firing squads. But if you've been watching Iannucci all this time, he's always been pointing in this direction.
Everybody is perfect, but man, Steve Buscemi's Nikita Khrushchev is amazing, and Simon Russell Beale is an evil bureaucratic monster playing Lavrentiy Beria.
It warms me ol' cockles that this is banned in Russia...because you know the underground DVD/file market on this is exploding.