Why an ekranoplan would add speed but little resilience

Would the Caspian Sea Monster have helped a Russian invasion of the Black Sea coast?

It could ferry reinforcements quickly, but its cost, specialization, and vulnerability would probably make it a short-lived white elephant.

The ground-effect vehicle offers one clear advantage: rapid ferrying of troops or supplies across water. That speed could reinforce a Black Sea operation more quickly than conventional shipping in favorable conditions. The benefit comes from a specialized and expensive vehicle with limited flexibility outside its designed route. Its size and operating profile would also make it a conspicuous target likely to be destroyed. The answer therefore labels it a white elephant: impressive as a unique capability, but too vulnerable and costly to carry the wider campaign.