Very soon the Russians will have taken most of the territory that the Ukraine forces have been holding and reinforcing for many years now. The areas along the Donbass borders. After that it will be easier for the Russians to advance. A lot of Ukraine forward military assets have been destroyed or overrun. All the while the Ukraine forces have been losing their better trained forces. In spite of foreign donations of military hardware, the Ukraine forces do not have much depth of resupply.
I feel it has reached a tipping point. Ukraine had the bulk of it’s forces and material on the Donbass borders. It is gone now. I think it will be a much faster advance for Russian forces now. If they choose to.