Russia fell back from northern Kherson including Davydiv Brid, the Ukrainians also launched a counter attack in the Donbass along the front near Bahkmut but it failed. They are really pushing now. Most of the units involved in these operations seem to be using western equipment or Soviet equipment from western sources, so these units were probably build up and held back for this offensive.
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The Ukrainians had a bridge head at Kupiansk and also you can see that there are no natural defences in the south and that the area is fairly open and with few urban areas, so I think they are withdrawing to form a new line along the next river along.