The defenders of Ukraine have observed atypical activity in the Black Sea; Russians have also deployed 20 vessels and a significant number of units of the auxiliary fleet vessels there.
They are monitoring the naval group in the Black Sea and the enemy’s actions carefully.
Atypical activities and several vessel groups have been recorded. Currently, there are 20 units in the Black Sea; one is underwater and includes four missile carriers; the salvo is 28...
https://www.marineinsight.com/shipping-news/russia-deploys-ships-in-the-black-sea/