Why does Dr. Sergei Markov claim Zelenskyy is prolonging the war in Ukraine?

According to Dr. Sergei Markov, a former Putin adviser, Zelenskyy is prolonging the war because he fears losing power if the conflict ends. Markov characterizes Zelenskyy as a 'maniac of the war' who is trying to continue the conflict 'as much as possible.' Markov claims that if the war were to stop, Zelenskyy would immediately lose political power and face legal consequences. Specifically, he suggests Zelenskyy would be subject to Ukrainian investigations and court proceedings because he 'failed' in some capacity, implying that the Ukrainian president is motivated by self-preservation rather than national interest.