It has been obvious that Zelensky is not in control to anyone that has any knowledge of his campaign, rise to power, and performance prior to the Russian military entry into the Ukraine. Originally his policy towards the Donbass was that people had a perfect right to speak Russian, he himself speaks Russian, as most Ukrainians do. He reasonably advocated tolerance of the ethnic diversity of the Ukraine and it's peoples, but the power availed to Azov, Right Sector, and other neonazi factions by their CIA sponsors, and their willingness to apply that power from the barrel of a gun, quickly reshaped his policies and government.
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Yes, it is noticeable by the change in his facial expression.
At the beginning of his presidential term, his face was bright and full of initiative, but the realization of the harsh reality changed his appearance from the head of state to the look of an experienced drug addict ...