In 1934 when he was only six, Prince Tomislav's father,
Alexander I, was assassinated and his elder brother Peter succeeded to the throne as King
Peter II of Yugoslavia. As he was still only 11, because of his young age, a
regency was established, headed by their father's cousin
Prince Paul of Yugoslavia. After initially declaring neutrality, on 25 March 1941, although King Peter and his advisors were opposed to Nazi Germany, the Regent, Prince Paul, under immense German pressure signed the
Tripartite Pact originally signed by Germany, Italy, and Japan. Two days later, in a British-supported
coup d'état opposing the Tripartite Pact, King Peter, then 17, was proclaimed of age, and the regency overthrown. Postponing
Operation Barbarossa, Germany simultaneously attacked Yugoslavia and Greece. From 6 April Luftwaffe pounded Belgrade for three days and three nights,
Operation Punishment. Within a week, Germany, Bulgaria, Hungary and Italy invaded Yugoslavia and the government was forced to surrender on 17 April. Yugoslavia was divided to satisfy Italian, Bulgarian, Hungarian and German demands and puppet Croat, Montenegrin and Serb states proclaimed. King Peter was forced to leave the country with the
Yugoslav government following the Axis invasion; initially the King went with his government to Greece, and Jerusalem, then to the British Mandate of Palestine and Cairo, Egypt. He went to England in June 1941, where he joined numerous other governments in exile from Nazi-occupied Europe. Local Yugoslav forces continued to resist the occupying
Axis powers. Initially the monarchy preferred
Draža Mihailović and his Serb-dominated
Četnik resistance. However, in 1944, the
Tito–Šubašić agreement recognised the Democratic Federal Yugoslavia as
a provisional government, with the status of the monarchy to be decided at a later date. Three regents,
Srđan Budisavljević, a Serb,
Ante Mandić, a Croat, and
Dušan Sernec, a Slovene, were sworn in at Belgrade on 3 March 1945. They appointed the new government, to be headed by Tito as prime minister and minister of war, with Šubašić as foreign minister, on 7 March. On 29 November 1945, while still in exile, King
Peter II was deposed by the
constituent assembly. The Federal People's Republic of Yugoslavia was internationally recognized as Yugoslavia while Peter II became a
pretender. ==Life in exile==