“Kyiv will come later after he controls the Donbas.”
It’s probably lost to him forever now, as he only got as far as he did by making a surprise attack from Belarus.
Now that surprise is spoiled and will never work again, and the Ukrainians will surely reinforce their defenses on that border.
Nothing surprising about the attack from Belarus. We called that as soon as it was reported that he was massing troops there. A plain look at the map told that story. But nobody even bothers with simple geography any more.