<P> Bulgaria's hand was finally forced by Germany's desire to intervene in the Italo - Greek War . This would require moving troops through Bulgaria . With no possibility of resisting Germany militarily, Prime Minister Bogdan Filov signed Bulgaria's adherence to the pact in Vienna on 1 March 1941 . He announced that this was done partly in gratitude for Germany's assistance to Bulgaria in obtaining the Treaty of Craiova with Romania, and that it would not affect Bulgaria's relations with Turkey or the Soviet Union . Later that day, Ribbentrop promised Filov that after the fall of Greece, Bulgaria would obtain an Aegean coastline between the Struma and Maritsa rivers . </P> <P> According to Article 17 of the Tarnovo Constitution, treaties had to be ratified by the National Assembly . In the case of the Tripartite Pact, the government sought to have the treaty ratified without debate or discussion . Seventeen opposition deputies submitted an interpellation and one, Ivan Petrov, asked why the Assembly had not been consulted in advance and whether the pact involved Bulgaria in war . They were ignored . The pact was ratified by a vote of 140 to 20 . </P> <P> On 25 March 1941 in Vienna, Dragiša Cvetković, Prime Minister of the Kingdom of Yugoslavia, signed the Tripartite Pact . On March 27, the regime was overthrown in a military coup d'état with British support . Seventeen - year - old King Peter was declared to be of age . The new Yugoslav government under Prime Minister and General Dušan Simović, refused to ratify Yugoslavia's signing of the Tripartite Pact, and started negotiations with Great Britain and the Soviet Union . The enraged Hitler issued Directive 25 as an answer to the coup, and then simultaneously attacked Yugoslavia and Greece starting on April 6 . The German Air Force bombed Belgrade for three days and nights . German ground troops moved in, and Yugoslavia capitulated on April 17 . </P> <P> The Independent State of Croatia (Nezavisna Država Hrvatska, or NDH) signed the Tripartite Pact on 15 June 1941 . </P>

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