>>50529
I think Russians have stockpiled considerable amount of resources which could last a while within that zone so if that's the case short term effect would be questionable.
But if Wagner could hold that line, the main junctions at least, a push along your blue arrows could be effective making the hold of positions unmanageable, and then cause the withdrawal of troops to consolidate the situation within Russia proper.
One lifeline is still there, via Kerch.