Yugoslav coup d'état in the context of "Regency"

The Balkans campaign of World War II began with the Italian invasion of Greece on 28 October 1940. In the early months of 1941, Italy's offensive had stalled and a Greek counter-offensive pushed into Albania. Germany sought to aid Italy by deploying troops to Romania and Bulgaria and attacking Greece from the east. Meanwhile, the British landed troops and aircraft to shore up Greek defences. A coup d'état in Yugoslavia on 27 March caused Adolf Hitler to order the conquest of that country.

The invasion of Yugoslavia by Germany and Italy began on 6 April 1941, simultaneously with the renewed invasion of Greece; on 11 April, Hungary joined the invasion of Yugoslavia. By 17 April the Yugoslavs had signed an armistice, and by 30 April all of mainland Greece was under German or Italian control. On 20 May Germany invaded Crete by air, and by 1 June all remaining Greek and British forces on the island had surrendered. Although it had not participated in the attacks in April, Bulgaria occupied parts of both Yugoslavia and Greece shortly thereafter for the remainder of the war in the Balkans.

The Tripartite Pact, also known as the Berlin Pact, was an agreement between Germany, Italy, and Japan signed in Berlin on 27 September 1940 by, respectively, Joachim von Ribbentrop, Galeazzo Ciano, and Saburō Kurusu (in that order) and in the presence of Adolf Hitler. It was a defensive military alliance that was eventually joined by Hungary (20 November 1940), Romania (23 November 1940), Slovakia (24 November 1940), Bulgaria (1 March 1941), and Yugoslavia (25 March 1941). Yugoslavia's accession provoked a coup d'état in Belgrade two days later. Germany, Italy, and Hungary responded by invading Yugoslavia. The resulting Italo-German client state, known as the Independent State of Croatia, joined the pact on 15 June 1941.

The Tripartite Pact was, together with the Anti-Comintern Pact and the Pact of Steel, one of a number of agreements between Germany, Japan, Italy, and other countries of the Axis powers governing their relationship.

Yugoslavia (/ˌjuːɡoʊˈslɑːviə/; lit. 'Land of the South Slavs') was a country in Central Europe and the Balkans that existed from 1918 to 2003. It came into existence following World War I, under the name of the Kingdom of Serbs, Croats and Slovenes, from the merger of the Kingdom of Serbia with the provisional State of Slovenes, Croats and Serbs, and constituted the first union of South Slavic peoples as a sovereign state, following centuries of foreign rule over the region under the Ottoman Empire and the Habsburg monarchy.

Under the rule of the House of Karađorđević, the kingdom gained international recognition on 13 July 1922 at the Conference of Ambassadors in Paris and was renamed the Kingdom of Yugoslavia on 3 October 1929. Peter I was the country's first sovereign. Upon his father's death in 1921, Alexander I went on to rule the country through an extended period of political crisis that culminated in the 6 January Dictatorship and, ultimately, his assassination in 1934. Prince Paul headed the state as a prince regent until Alexander's son Peter II was declared of-age, which happened following the Yugoslav coup d'état in March 1941. Alexander I was the longest reigning of the three Yugoslav monarchs.

The invasion of Yugoslavia, also known as the April War or Operation 25, was a German-led attack on the Kingdom of Yugoslavia by the Axis powers which began on 6 April 1941 during World War II. The order for the invasion was put forward in "Führer Directive No. 25", which Adolf Hitler issued on 27 March 1941, following a Yugoslav coup d'état that overthrew the pro-Axis government.

The invasion commenced with an overwhelming air attack on Belgrade and facilities of the Royal Yugoslav Air Force (VVKJ) by the Luftwaffe (German Air Force) and attacks by German land forces from southwestern Bulgaria. These attacks were followed by German thrusts from Romania, Hungary and the Ostmark (modern-day Austria, then part of Germany). Italian forces were limited to air and artillery attacks until 11 April, when the Italian Army attacked towards Ljubljana (in modern-day Slovenia) and through Istria and Lika and down the Dalmatian coast. On the same day, Hungarian forces entered Yugoslav Bačka and Baranya, but like the Italians they faced practically light resistance. Italians moved into Dalmatia also from Italian-controlled Albania, after repelling an initial Yugoslav attack there.

On 25 March 1941, Yugoslavia signed the Tripartite Pact with the Axis powers. The agreement was reached after months of negotiations between Germany and Yugoslavia and was signed at the Belvedere in Vienna by Joachim von Ribbentrop, German foreign minister, and Dragiša Cvetković, Yugoslav Prime Minister. Pursuant to the alliance, the parties agreed that the Axis powers would respect Yugoslav sovereignty and territorial integrity, including the Axis refraining from seeking permission to transport troops through Yugoslavia or requesting any military assistance.

Yugoslav accession to the Tripartite Pact (Serbo-Croatian: Тројни пакт / Trojni pakt) was short-lived, however. On 27 March 1941, two days after the agreement had been signed, the Yugoslav government was overthrown when the regency led by Prince Paul was ended and King Peter II fully assumed power. On 6 April 1941, less than two weeks after Yugoslavia had signed onto the Tripartite Pact, the Axis invaded Yugoslavia. By 18 April, the country was conquered and occupied by the Axis powers.

Peter II Karađorđević (Serbo-Croatian: Петар II Карађорђевић, romanized: Petar II Karađorđević; 6 September 1923 – 3 November 1970) was the last King of Yugoslavia, reigning from October 1934 until he was deposed in November 1945. He was the last reigning member of the Karađorđević dynasty.

The eldest child of King Alexander I and Maria of Romania, Peter acceded to the Yugoslav throne in 1934 at the age of 11 after his father was assassinated during a state visit to France. A regency was set up under his cousin Prince Paul. After Paul declared Yugoslavia's accession to the Tripartite Pact in late March 1941, a pro-British coup d'état deposed the regent and declared Peter of age.

Živan Knežević (Serbian Cyrillic: Живан Кнежевић; 28 July 1906 – 1 December 1984) was a major in the Yugoslav Royal Guards who was a key conspirator in the Yugoslav coup d'état of 27 March 1941 that deposed the regency of Prince Paul, Dr. Radenko Stanković and Dr. Ivo Perović, as well as the government of Prime Minister Dragiša Cvetković.

Knežević and his fellow plotters declared the 17-year-old King Peter to be of age and brought to power a government of national unity led by Air Force General Dušan Simović. The coup resulted in the German-led Axis invasion of Yugoslavia during which the armed forces of Yugoslavia were defeated within 11 days. Fleeing the country by air, Knežević was based in Alexandria for a period, where he briefly commanded a battalion of Yugoslav Royal Guards formed with British assistance. He subsequently served as a military liaison officer between the Chetniks of Draža Mihailović and the Yugoslav government-in-exile then after promotion to lieutenant colonel he served as a military attaché in the United States until the end of the war, by which time he had achieved the rank of colonel. He remained in the US after the war and died in 1984.

Radoje Knežević (Serbian Cyrillic: Радоје Кнежевић; 20 August 1901 – 22 June 1983) was a key member of the group that organised the Yugoslav coup d'état of 27 March 1941 that deposed the regency of Prince Paul, Dr. Radenko Stanković and Dr. Ivo Perović, along with the government of Prime Minister Dragiša Cvetković. Following the coup he was appointed as the Minister of the Royal Court, and after the resulting invasion of Yugoslavia, he accompanied the King and government into exile in Cairo then London. Along with his brother Živan Knežević, he was a member of the so-called "League of Majors", which was at the centre of the ill-fated Greater Serbian agenda of the Yugoslav government-in-exile and who was instrumental in having Draža Mihailović appointed as Chief of Staff of the Yugoslav Supreme Command. He was sidelined in June 1943 when he was appointed to the Yugoslav legation in Portugal. He remained in exile after the war, was sentenced to 10 years imprisonment with hard labour in absentia during the Belgrade Process conducted by the country's newly-established communist authorities, and emigrated to Canada where he lived until his death in 1983.