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The Craiova Group (Quadrilateral), Craiova Four, or C4 is a cooperation project of four statesRomania, Bulgaria, Greece and the purposes of furthering their European integration as well as economic, transport and energy cooperation with one another. The Group originated in a summit meeting of the heads of governments of Bulgaria, Romania and Serbia, held on 24 April 2015 in the Romanian city of Craiova. At the group's inaugural meeting, Romania's then-Prime Minister Victor Ponta indicated that he was inspired by the Visegrád Group. Romania and Bulgaria both joined the European Union in 2007, while Serbia has been in accession negotiations since 2014. Since 2017 meeting in Varna, Bulgaria and the inclusion of Greece, meetings have been quadrilateral.
One of the first initiatives, after a meeting in Vidin, Bulgaria, was to strengthen the telecommunication networks in the border areas of the countries. Other goals include helping Serbia join the European Union and the construction of a motorway linking Bucharest, Sofia and Belgrade.
On 2 November 2018, Prime Minister of Bulgaria Boyko Borisov stated that Prime Minister of Greece Alexis Tsipras proposed joint bid for the 2030 FIFA World Cup by Bulgaria, Romania, Serbia and Greece during the meeting in Thessaloniki.
==Current leaders==
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| Population | 19,051,562 (2023) | 6,447,710 (2022) | 10,482,487 (2022) | 6,664,449 (2023) | |
| Area | 238,397 km2 (92,046 sq mi) | 110,993.6 km2 (42,854.9 sq mi) | 131,957 km2 (50,949 sq mi) | 77,747 km2(29,913 sq mi)(excluding Kosovo) | |
| Population Density | 84.4/km2 (218.6/sq mi) | 58/km2 (165.8/sq mi) | 79,4/km2 (212.4/sq mi) | 86/km2 (230.5/sq mi) | |
| Government | Unitary state semi-presidential constitutional republic | Unitary state parliamentary constitutional republic | Unitary state parliamentary constitutional republic | Unitary state parliamentary constitutional republic | |
| Capital | Bucharest – 1,716,961 (2,304,408 metro) | Sofia – 1,248,452 (1,667,314 metro) | Athens – 643,452 (3,638,281 metro) | Belgrade – 1,383,875 (1,681,405 metro) | |
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| Official language | Romanian | Bulgarian | Greek language | Serbian language | |
| First Leader | Alexandru Ioan Cuza, Domnitor of the United Principalities (first ruler of the modern unified state). Burebista, King of Dacia (first leader of the Romanian peoples). | Khan Asparuh of Bulgaria (founder of the First Bulgarian Empire) | Governor Ioannis Kapodistrias (first head of state of the modern independent state) | Prince Višeslav of Serbia (first ruler known by name) | |
| Current Head of Government | Prime Minister Cătălin Predoiu (PNL) | Prime Minister Rosen Zhelyazkov (GERB) | Prime Minister Kyriakos Mitsotakis (New Democracy) | Prime Minister Đuro Macut (Independent) | |
| Current Head of State | President Nicușor Dan (Independent) | President Rumen Radev (Independent) | President Katerina Sakellaropoulou (Independent) | President Aleksandar Vučić (SNS) | |
| Main religions | 81% Eastern Orthodox, 6.2% Protestant, 5.1% Catholic, 0.2% irreligious, 1.5% Other religious | 59.5% Eastern Orthodox, 9.3% irreligious, 7.9% Islam, 0.9% Protestant, 0.7% Roman Catholic | 90% Eastern Orthodox, 3% Other Christians (excluding Catholic), 4% irreligious, 2% Islam, 3% Other religious (including Eastern or Western Catholic) | 81.1% Eastern Orthodox, 4.2% Islam, 3.9% Roman Catholic, 1.1% irreligious, 1% Protestant | |
| Ethnic groups | 88.9% Romanians, 6.1% Hungarians, 3.3% Roma, 0.2% Ukrainians, 0.2% Germans | 84.8% Bulgarians, 8.8% Turks, 4.9% Roma, 0.7% others | Greek 91.6%, Albanian 4.4%, other 4% | 80.6% Serbs, 2.8% Hungarians, 2.3% Bosniaks, 2% Roma, 12.3% others | |
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| External debt | 36.8 % of GDP | 20.4 % of GDP | 178.2 % of GDP | 48.2 % of GDP | |
| Currency | Romanian Leu (L) – RON | Bulgarian lev (лв) – BGN | Euro (€) – EUR | Serbian dinar (din) – RSD | |
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