Mezue ahịrịokwu na-esonụ: N'ihi "Anschluss" nke March 1938, bụ́ nke Germany jikọtara Austria na ya, Yugoslavia bịara soro Germany kerịta ókèala ya nke ebe ugwu ọdịda anyanwụ ma daba n'okpuru nrụgide na-arịwanye elu ka ndị agbata obi ya jikọtara onwe ha na ike Axis. N'April 1939, Ịtali wakporo Albania ma weghara ya, si otú ahụ mee ka ókèala ala nke abụọ ya na Yugoslavia dịrị. Mgbe Agha Worldwa nke Abụọ malitere, Gọọmentị Royal Yugoslav kwupụtara nnọpụiche ya. N'agbata Septemba na Nọvemba 1940, Hungary na Romania sonyeere Nkwekọrịta Atọ ahụ, na-akwado ndị Axis, na Italy
weghaara Gris. Ka ọ na-erule n'oge ahụ, ọ fọrọ nke nta ka ọ bụrụ na mba ndị na-achị Axis na ndị ha na ha na-emekọ ihe gbara Yugoslavia gburugburu kpamkpam, ọ dịghịzikwa ekwe ka Yugoslavia tinye aka n'agha ahụ. Ná ngwụsị February 1941, Bulgaria sonyeere Nkwekọrịta ahụ. N'echi ya, ndị agha Germany si Romania banye Bulgaria, na-emechi mgbanaka ahụ gbara Yugoslavia gburugburu.