Ooops... I took me a while to realise. Snake Island will be used as the bait for the Russian navy in the B.S. There is no intention to "re -capture" in the short term, just to make it look like it could actually be captured and destroy anything getting near by. Quite strategic giving it's proximity to Romania and other countries in the Balcans. Short of a Cuba.
Income potential for the Ukrainian postal service too.
The island is quite small though. I wonder what happens when it's all covered in imaginary downed Bayraktars. I hope it warps through a wormhole into the Red Square.