As we discussed earlier, just don't see what it could do. A minimal force could hold them at bay for two reasons A.) They have to leave some forces at the ammo dump or they must blow it and B.) Ukraine would have air superiority in this region with the Moskva gone and would most likely just maul any convoys.Honestly, I think they feel they (desperately) need to blunt Ukrainian counter towards Kherson, and they're willing to throw away PMR to get that done, at least until they run the "referendum" and proclaim KhNR. Because obviously that would make their presence in the "Taurida Guberniya" 100% legitimate.
"Corridor to Crimea for May 9th" is the bare minimum they are aiming for.
That said they could go into Moldova itself since they are not fully prepared and just cause chaos for the West (or that is what they imagine).