It's the fractal siege again, and the chain is easy to name. The 20th is the weak link and has been since it failed to close the Borova pocket. The 25th, which owns Lyman axis, has spent the campaign waiting on the 3rd to make its position mean something from the south.
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Kramatorsk: The Fractal Siege
This is Army Group South and Army Group West running their halves of the same eventual objective, both still stuck at the stage the strategic picture flagged back when the offensive opened: reduce the approaches before reorienting onto the real target.