Greek officials said on Thursday, May 21, that a sea drone discovered near the island of Lefkada posed a serious security threat and was identified as a Ukrainian unmanned surface vessel (USV). According to CNN Greece , an investigation report on the incident was delivered to the Greek prime minister’s office last week and included a detailed technical analysis of the drone. JOIN US ON TELEGRAM Follow our coverage of the war on the @Kyivpost_official . Greek Defense Minister Nikos Dendias said