Just to underline what this comment is saying: this type of breakthrough was the wet dream of WW1. The race to the sea, where the western front was established, was based on finding a flank and turning it. That was the objective of most warfare up to that point, and it ended because they ran out of ground on which to turn a flank. Then they couldn’t meaningfully break through the defenses (or layers of, to be more accurate), like we see Ukraine doing in Kursk. If they turn the flank, they’ll have routing russians for days, and have achieved maneuver warfare again.