Rubuta ci gaba don wannan sakin layi - Bayan "Anschluss" na Maris 1938, lokacin da Jamus ta haɗu da Ostiryia, Yugoslavia ta zo ta raba iyakarta ta arewa maso yamma da Jamus kuma ta faɗa cikin matsin lamba yayin da maƙwabta suka haɗa kansu da ikon Axis. A watan Afrilu na shekara ta 1939, Italiya ta kai wa Albania hari kuma ta mallake ta, ta haka ne ta kafa iyaka ta biyu da Yugoslavia. A lokacin barkewar Yaƙin Duniya na II, Gwamnatin Sarautar Yugoslavia ta ayyana tsaka tsaki. Tsakanin Satumba da Nuwamba 1940, Hungary da Romania sun shiga Yarjejeniyar Tripartite, suna daidaita kansu da Axis, kuma Italiya ta mamaye Girka
Ka yi haƙuri. A lokacin, ƙasashen da ke ƙarƙashin ikon Axis da kuma ƙasashen da suke ƙarƙashin ikonsu sun kewaye Yugoslavia gabaki ɗaya, kuma matsayinta na tsaka tsaki game da yaƙin ya zama da wuya. A ƙarshen Fabrairu 1941, Bulgaria ta shiga cikin Yarjejeniyar. Kashegari, sojojin Jamus sun shiga Bulgaria daga Romania, suna rufe zoben da ke kewaye da Yugoslavia. Da yake yana son ya tabbatar da kudancinsa don harin da ke gabatowa a kan Tarayyar Soviet, mai mulkin kama karya na Jamus Adolf Hitler ya fara matsa lamba sosai a kan Yugoslavia don ta shiga Axis. A ranar 25 ga Maris, 1941, bayan wani jinkiri, Gwamnatin Sarautar Yugoslavia ta rattaba hannu kan Yarjejeniyar. Kwana biyu bayan haka, wata kungiyar masu goyon bayan Yammacin Turai, 'yan kasar Serbia masu kishin kasa Royal Yugoslav Air Force jami'an sun hambarar da sarkin kasar, Prince Paul, a cikin wani juyin mulki mara jini. Sun sanya dan dan uwansa Peter a kan karagar mulki kuma suka kawo mulki ga gwamnatin hadin kan kasa karkashin jagorancin shugaban Rundunar Sojan Sama ta Yugoslav, Janar Dušan Simović. Juyin mulkin ya fusata Hitler, wanda yake so ya rushe Yugoslavia, wanda ya kira shi "Versailles gina". Don haka nan da nan ya ba da umarnin mamaye Yugoslavia, wanda ya fara a ranar 6 ga Afrilu.