BBC News: Ukraine's deep strike campaign and changing capabilities

In the South, the Ukrainians don't have to put troops in to try and cut off the land bridge between Russia proper and Crimea. If they can get fire control over it so that their drones can sort of cover that area and target logistics going west to east and east to west, then it has the same effect, which is actually to isolate Crimea. So the position in the south of the country has changed remarkably in the last couple of months."