I think that as soon as a worthy politician is found, a change of power will immediately occur by popular will. And not a single sane person will exchange a good leader for a vague future for the sake of some "principles of democracy"
Are you beating around the bush, but still can't bring yourself to ask the questions that are important to you?
By poisoning, do you mean Navalny?
According to US law, such a person would be in prison for life... he is clearly a foreign agent, a saboteur, an enemy of the state.

Where are you from?