>Marie Antoinette literally had to lose her head for this to happen.
Arguably it was actually Robespierre losing is head that had to happen to stop the madness (Terror) in France, or at least create the conditions for it to stop eventually.
I don't know what has to happen in Russia. It is possible for autocratic states, that have always been autocratic, to transition to liberal democracy. It did happen in France, but even after the end of the Terror it still went through a long phase of imperial autocracy. It takes time to develop institutions strong enough to resist autocracy.
Arguably it was actually Robespierre losing is head that had to happen to stop the madness (Terror) in France, or at least create the conditions for it to stop eventually.
I don't know what has to happen in Russia. It is possible for autocratic states, that have always been autocratic, to transition to liberal democracy. It did happen in France, but even after the end of the Terror it still went through a long phase of imperial autocracy. It takes time to develop institutions strong enough to resist autocracy.