Of course they won't admit defeat
Have you ever heard Zelensky admit to any type of error?
The guy is quite petulant.
His former ambassador to the UK, said it was inappropriate for Zelensky to make snide remarks in response to Ben Wallace's pleas for "a bit more gratitude". What did Zelensky do? He fired him.
His ambassador to Germany, had a habit of praising Bandera and telling Poles to stop moaning about Volyn. From every corner, you could hear voices arguing for Melnyk to be dismissed. What did Zelensky do? He promoted him to Deputy Foreign Minister.
His chief general wrote an essay for The Economist, in which he argued that the war has come to an intractable stalemate, requiring the development of new and unique solutions. Zelensky gave a press conference the next day, stating that there is "no stalemate" and complained about people refusing to stay in their lanes. Two months later - he fired Zaluzhny.
I could go on and on and on...
Zelensky makes Putin look like a patient and forgiving leader. Indeed, we literally had Prigozhin daily recording videos where he called Putin an "old man" and told him frequently "to go and get f*cked", and Putin didn't do anything until the guy organized an armored convoy headed to Moscow.
Putin allowed himself to be persuaded by Surovikin to a humiliating withdrawal from Kherson, even though he had spent the months before that proclaiming that Kherson will never again leave Russia. This preserved the bulk of our forces there, and allowed them to take up more advantageous positions on the other side of the Dniepr. It's hard for me to imagine, Zelensky giving such an order that could undermine his PR pronouncements.
Instead, it's the same template every time. Calls for heroism, for even more spectacular sacrifice, and for more Western aid. This is why he is so incredibly unpopular with the top of the Ukrainian military. He throws them under the bus and always makes them into the "bad guys", when in reality objectives are being set and reinforced by the political leadership.