Boy, with all of these breakthroughs Russia must be ready to surrender. No need for more money to Ukraine, then.
This is the first Ukrainian breakthrough in this war. Indeed, it is the first real breakthrough by anyone since Russia attempted a coup de main in the first two weeks.
It has led to the opportunity for operational maneuver, that is, to exploit breakthoughs to threaten enemy rear areas and achieve decisive results. In this case the Ukrainians have, or are close to, isolating a large part of the Russian military in Ukraine.
It is the same sort of thing, in proportional scale, as the American breakthrough at St. Lo in 1944 (Operation Cobra). It led to the Falaise pocket and Pattons breakout into the German rear.
Or, if you like, Ariel Sharons crossing of the Suez canal in 1973, which trapped the Egyptian 3rd Army.
This event is almost in that category at this point. It remains to be seen if the Ukrainians can go the last little bit, or whether the Russians can do anything to retreive the situation.