Has anyone actually defected with a warship?
Short answerThere are attempted and wartime collective cases, but a ship is much harder to defect with because many crew members must cooperate.
NotesWhether these examples count as defection depends partly on how wartime changes of allegiance are classified. The free navies of the Second World War and Italian ships attempting to reach the Allies are offered as possible examples under that broader definition. Attempts by officers aboard Russian vessels are also mentioned without identifying individual ships. A warship requires many more people to cooperate than an aircraft or tank.