No, but one is easier to understand than the other. Spending a ton of intelligence capital on a complicated clandestine demolition operation just to impoverish

No, but one is easier to understand than the other. Spending a ton of intelligence capital on a complicated clandestine demolition operation just to impoverish a region under context just doesn't make a lot of sense, even for Putin. At best it's a side benefit. It also requires that you assume Putin genuinely believes he's going to lose Crimea in this war, which seems questionable (a Ukrainian military conquest of the peninsula is a *huge* ask, much more so than just retaking the occupied Donetsk territory). The tactical explanation, and especially the timing, really seems much more likely.