Three days prior , VVKJ Major Vladimir Kren had defected Escaping to the Germans , disclosing Reveal_secret the locations Placing of multiple military assets , as well as elucidating the VVKJ 's codes .

Three days prior , VVKJ Major Vladimir Kren had defected Escaping to the Germans , disclosing Reveal_secret the locations Placing of multiple military assets , as well as elucidating the VVKJ 's codes .

The bombing Attack of Belgrade was preceded Process_start by the commencement of the ground invasion a few hours earlier , and coincided with air attacks Attack on VVKJ airfields and other strategic targets across Yugoslavia .