You mean when or if Putin invades? I'm not sure. I think he's massed troops at the Ukrainian border for two reasons: 1) he is afraid the status quo (him controlling Crimea and the Donbass) changing, and 2) to extract potential concessions from NATO.
If he ends up concluding that the status quo won't change, then I doubt he does anything. However, this build up of forces is different from 2018 because it's larger and he's coupled it with very specific demands he wants from NATO, in writing. It seems like Putin has to do something this time, assuming NATO doesn't agree to any of the proposed concessions (which they won't because they are non-starters).
He really comes off looking like a fool if he commits resources to this big build up, makes specific demands, doesn't get them, then simply does nothing.