Cause they are winning, at their own pace.
All advantage Ukraine, and yet, losing and losing in huge numbers. Barely any tanks left. Barely any planes left. Barely any artillery left. Barely any ammunition left. 150K-200K men dead or wounded. Ukrainian economy in shambles. Mud season almost in play with Winter fast approaching. Ukrainian vaunted defensive line busted. Etc., etc., etc.
Let me know when the comedian ZelenskyyIdiot or BidenIdiot reaches the level of chess playing that Putin has been putting on their collective asses, kkthx.
So ukraine has no army left and still rizzia cant even capture the little town of bakut yet alone kharkiv and odessa.