 Complete the following phrase:  After the Invasion of Yugoslavia, the country was occupied by Germany and some regions were occupied by Italy, Hungary, Bulgaria and Albania. A joint German-Italian puppet state called Independent State of Croatia was installed. After a bombing campaign on major Serbian cities, a German puppet regime Nedićs Serbia led by Milan Nedić was installed. In collaboration with the German Army, Serbian Chetnik collaborators along with the Serbian Volunteer Corps as well as the Serbian State Guard assisted in the persecution of Jews in Serbia proper, in Hungarian-occupied Vojvodina region, and in the territory held by the Croatian Ustashas. Serbian Jews who were not transported to concentration camps in Germany were either murdered in Nazi concentration camps within Serbia Sajmište and Banjica, Banjica being jointly controlled by Nedics Government and the German Army, or transported to Ustasha-controlled concentration camp Jasenovac and murdered there. Jews living in Hungarian-occupied regions faced mass executions, the most notorious being the 