"On October 24, at about 4 a.m. Moscow time [01:00 GMT], three unmanned boats of the Ukrainian Navy were detected by technical surveillance equipment in the northern part of the Black Sea. The area where unmanned boats were detected was hit by anti-sabotage missile and bomb systems," the ministry said in a statement.
A set of anti-mine and anti-sabotage measures is being implemented on the outer roadstead of Sevastopol Bay, the statement read.