UK’s parliamentary model spread power via coalition; Ukraine’s semi-presidential setup concentrates it in Zelensky, though Parliament retains legislative monopoly.

Because that's when the word was created and is the most applicable description of what zelensky is... What else would you call him?

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That's sort of what Trump was subtly trying to get at -- Zelenskyy's political power continues as long as the war continues. If we take the worst interpretation of his character that he is willing to do whatever it takes to hold onto power for as long as possible ... then he has an incentive to sabotage any peace deals.

I personally don't think that's likely, but it is a valid argument depending on how skeptical you are about Zelenskyy's motives.