Vladimir Kren

Vladimir Kren was a Croatian major general and commander of the Air Force of the Independent State of Croatia (ZNDH) during World War II. He was an officer in the Royal Yugoslav Air Force (VVKJ) before the war. In April 1941, he defected to Nazi Germany and handed over the locations of many of the VVKJ's dispersal airfields and exposed many of its codes. This made it easier for the Luftwaffe to destroy the VVKJ during the Axis invasion of Yugoslavia, which began shortly after Kren's defection.