If Ukraine is going to do all this cleverly, they are gonna withdraw bit by bit, letting russians to die en masse for every inch...and not stand until last man is spent like fools just to ensure that meaningless inch is kept under Ukraine's control.
That inch is going to be taken back one day and my god if Russia insists in keeping it occupied, Saint HIMARS, Leopard, Abrams and the whole fucking pantheon of death will rain such fury on their worthless orc asses that the world will never forget that vengeance that will echo in those days.
And it is not even an unlikely scenario, Russia will happily kill off every capable man of a revolution they don't have the balls to do anyway, just in case!