ATHENS, Greece (AP) — Greece's defense minister said Tuesday that a military sea drone reportedly carrying explosives that was discovered on a Greek island last week is Ukrainian-built, describing the incident as a threat to Mediterranean Sea navigation and an “extremely serious issue. "A fisherman on the island of Lefkada found the craft inside a coastal cave on May 7 and towed it close to a nearby harbor. It was moved a day later to a naval base on the mainland for inspection and the to...