Ukrainian uncrewed surface drone attack reported to sink FSB border patrol ship near Gelendzhik

A Russian milblogger claims Ukrainian forces used an uncrewed surface vessel (BЭК/USV) to attack an FSB Border Service patrol ship, reportedly sinking the vessel "Izumrud" at the pier in Gelendzhik. The post discusses perceived shortcomings in port defenses and proposes expanded UAV/FPV use for maritime surveillance and interception.