Zelensky supplies comes from the west. Israel on te other hand determines what comes and go in gaza. Anyway, idf was humiliated on 7th october. Their gaza border military base at was overwhelmed and eventually israel fired hell fire missiles to kill their own soldiers just to get at hamas freedom fighters. IDF already lost the war. The current destruction of gaza is just bloodlust revenge. After over one month, hamas is still alive and well.
Plus zelensky cannot stop the war or he will be killed.