Russians have already dug about 200 kilometres of trenches on the coasts of the temporarily occupied Crimea

The Russian command is afraid of the Ukrainian landing operation. 

This is evidenced by a video posted by Vladyslav Nazarov, spokesman for the Pivden Operational Command.

It shows a line of trenches that the Russians have dug on the coast of Yevpatoria.

As a reminder, in December 2022, the Defence Intelligence of Ukraine reported on Russia's desire to strengthen the coastline further.