Putin is not a mad dictator ruling against everyone’s wishes. He’s a leader of a large establishment elite which shares his views and gets very rich. If you replace Putin, most likely outcome is his replacement will not be very different (and probably worse, since the country will be even more anti-Western after the assassination)

Except, like Trump, they get more stupid as you go.

Nope. Putin _is_ a mad dictator completely disconnected from the realities of Russia. Just like Maduro in Venezuela. So if he's killed, nobody is going to be bothered by this except a few dozen of his closest allies.

Putin's regime is purely authoritarian ("information autocracy") it has _no_ ideology. Moreover, the government in Russia does everything it can to keep the population passive.

And before you ask, Iran was different because it's _not_ an authoritarian country. It's a full-blown totalitarian theocracy with an official ideology and the elites there actually _believe_ in their doctrine. They have a core of people who will die rather than betray it. And most importantly, they have actual institutions that can survive the death of individuals.