It depends if this deal is about a ceasefire or a final deal. If it is about a final deal then this is a complete strategic failure for Russia.True but this deal is still much better than I'd thought for Ukraine. It is the absolute minimum for Russian to be able to walk away with face and they still give up substantial gains on the ground in exchange for 2014-2015 borders (before Ukraine retook half of Donetsk and Lugansk).
If they don't take the deal now it is going to get worse not only in terms but for their infrastructure destruction. Right now there are still intact cities, the longer the fighting goes the worse the rebuilding would be.
If ceasefire, it is ok, unless they drag out the final deal negotiations, in which case it will also be just slightly less of a complete strategic failure.
The amount of economic damage that Russia has taken from those sanctions mean that if they don't get a huge amount of geostrategic land, either annex or vassal state, out of this attack then it is a failure.
Win/defeat can only be seen on what Russia has lost on this invasion and what it will gain.