The only thing that is unclear about the following clip released by the Ukraine's Border Guard supposedly capturing Russians "digging in" on a key route linking Crimea to the rest of the Ukraine, is what is funnier: that the Russian soldier is "painting" the drone with a laser flashlight, or that according to the Ukrainians said action was evidence the drone was being "shot at" by Russian soldiers.
As a follow up, here is another video made by a Ukrainian drone showing the distribution of Russian forces on the peninsula.