Pedzisa mutsara unotevera: Munguva yechando ya1940/41, Ribbentrop akanyatsomanikidza Humambo hweYugoslavia kuti husayine Chibvumirano cheMatatu, pasinei nezano rakabva kuGermany Legation muBelgrade kuti chiito chakadaro chingangotungamirira kukudzingwa kwaMuchinda weCrown Prince Paul, Mutongi weYugoslavia. Chinangwa chaRibbentrop chaiva chokuwana kodzero dzokupfuura nomunyika yacho izvo zvaizobvumira vaGermany kupinda muGreece. Musi wa 25 March 1941, Yugoslavia yakasaina Tripartite Pact; zuva rakatevera racho mauto eYugoslavia akakoromora Muchinda Paul mukubudirira kusina ropa. Apo Hitler akarayira kupinda muYugoslavia, Ribbentrop akanga achishora, nokuti aifunga kuti Foreign Office yaizobviswa mukutonga Yugoslavia yaigarwa. Sezvo Hitler akanga asingafariri Ribbentrop pamusana pokushora kwake kupinda kwacho, gurukota racho rakaenda kunorara kwemazuva mashomanana akatevera. Apo Ribbentrop akapora, akatsvaka mukana wokuwedzera pesvedzero yesangano rake kupfurikidza nokupa kuzvitonga kweCroatia. Ribbentrop akasarudza Ustaša kutonga Croatia. Akaita kuti Edmund Veesenmayer abudirire kupedzisa hurukuro muna Kubvumbi 1941 naGeneral Slavko Kvaternik weUstaša pakuita kuti bato rake ritonge Croatia mushure mekupinda kweGerman. Achiratidza kusagutsikana kwake neGermany Legation muBelgrade, iyo yakanga yarayira pamusoro pekumanikidza Yugoslavia kusaina Chibvumirano cheTripartite, Ribbentrop akaramba kuti German Legation ibviswe pamberi peGermany
bhomba reBelgrade musi wa6 April 1941. Tsvimbo yacho yakasiyiwa kuti irarame nokupisa-bhomba zvakanakisisa sezvaiita.