Mezue ahịrịokwu na-esonụ: Bulgaria sonyere na mwakpo Axis nke Yugoslavia na Gris site n'ikwe ka ndị agha Germany wakpo site na ókèala ya ma ziga ndị agha na Gris na Eprel 20. Dị ka ụgwọ ọrụ, ike nke Axis kwere ka Bulgaria weghara akụkụ nke mba abụọ ahụ - ndịda na ndịda ọwụwa anyanwụ Yugoslavia (Vardar Banovina) na ebe ugwu ọwụwa anyanwụ Gris (akụkụ nke Greek Macedonia na Greek Thrace). Ndị agha Bulgaria nọ n'ógbè ndị a nọrọ afọ ndị sochirinụ na-alụ ọgụ megide òtù mba dị iche iche na ndị na-eguzogide agha. N'agbanyeghị nrụgide Germany, Bulgaria esonyeghị na mwakpo Axis nke Soviet Union ma n'ezie ekwupụtaghị agha megide Soviet Union. Ihe
Agbanyeghị, ndị agha ụgbọ mmiri Bulgarian tinyere aka n'ọtụtụ ọgụ na Soviet Black Sea Fleet, nke wakporo ụgbọ mmiri Bulgarian.