Instruct: Given a question, retrieve documents that answer the question.
Query: When did the peace treaty between Croatia and Serbia go into effect?
On 20 November 1991 Lord Carrington asked: "Can the internal boundaries between Croatia and Serbia and between Bosnia and Herzegovina and Serbia be regarded as frontiers in terms of public international law?" Applying the principle of "uti possidetis juris", the commission concluded on 11 January 1992, "The boundaries between Croatia and Serbia, between Bosnia and Herzegovina and Serbia, and possibly other adjacent independent states may not be altered except by agreement freely arrived at... Except where otherwise agreed, the former boundaries become frontiers protected by international law".
Before 1918, both countries were part of Austria–Hungary. However, after the Ausgleich of 1867 Czechia belonged to the Austrian Empire while Slovakia belonged to the administratively separate Kingdom of Hungary, and between 1918 and December 31, 1992, both countries were part of Czechoslovakia. 
Both countries established diplomatic relations on January 1, 1993. These international relations are usually referred to or described as "very good", "cordial", and "above standard" in the media. When a Czech or Slovak president is inaugurated, very often his first international visit is to the former part of the common country. The same custom applies to newly elected prime ministers of the Czech Republic and Slovakia.
NATO was responsible to the United Nations (UN) for carrying out the Dayton Peace Accords. The Dayton Peace Accords were started on 22 November 1995 by the presidents of Bosnia, Croatia, and Serbia, on behalf of Serbia and the Bosnian Serb Republic. The actual signing happened in Paris on 14 December 1995. The peace accords contained a General Framework Agreement and eleven supporting annexes with maps. The accords had three major goals: ending of hostilities, authorization of military and civilian program going into effect, and the establishment of a central Bosnian government while excluding individuals that serve sentences or under indictment by the International War Crimes Tribunals from taking part in the running of the government. IFOR's specific role was to implement the military Annexes of "The General Framework Agreement for Peace (GFAP) in Bosnia and Herzegovina".
The Government of Serbia was formed on 15 May 2007 after three-month-long negotiations and fierce political scandals and fighting that much disturbed the population, and exactly seven minutes before midnight when the three-month constitutional deadline would pass. It is formed by the Democratic Party (including the minority Sanjak Democratic Party), the coalition of the Democratic Party of Serbia and New Serbia, and G17 Plus. The DS, DSS-NS and G17+ parliamentary clubs elected the new cabinet proposed by Vojislav Koštunica (DSS), the previous Prime Minister, with the further support of some of the minorities (List for Sanjak and Roma Union of Serbia) votes accumulating 133 of the parliament's 250 seats. The Cabinet was sworn shortly before midnight, the deadline, in front of Milutin Mrkonjić (SPS), the temporary acting Speaker. The five new Ministers (Dragan Šutanovac, Božidar Đelić, Milan Marković, Mlađan Dinkić and Dušan Petrović) that were Deputies in the parliament have immediately filed their resignations, as per the Constitution which disables a Minister to be an active member in the National Assembly.
The Drina River is an important symbol of Serbian national identity, serving as the boundary between Bosnia and Serbia. By the outbreak of World War I, Bosnia had been under the control of Austria-Hungary since 1878. The Serbian defeat of Austro-Hungarian forces at the Battle of Cer in August 1914 was the first Allied victory over the Central Powers during World War I. Stanislav Binički composed what became known as "March on the Drina" shortly after the battle to commemorate the Serbian victory. He dedicated it to his favourite commander in the army, Pukovnik or Colonel Milivoje Stojanović Brka, who fought at the Battle of Cer but who was killed in a subsequent battle in December. His composition was initially titled "March to Victory". Some scholars have hypothesized that Binički based his work on an Ottoman Turkish military march. "March on the Drina" symbolized the desire of Serbs in the Kingdom of Serbia to unite with those living in Bosnia. The song experienced widespread popularity during and after World War I. It was seen as a symbol of Serbian resistance to the Great Powers and became one of the most famous Serbian nationalist songs, as described by author Eric D. Gordy.
Croatian is the official language of Croatia, and became the 24th official language of the European Union upon its accession in 2013. Minority languages are in official use in local government units where more than a third of population consists of national minorities or where local legislation defines so. Those languages are Czech, Hungarian, Italian, Ruthenian, Serbian, and Slovak.
According to the 2011 Census, 95.6% of citizens of Croatia declared Croatian as their native language, 1.2% declared Serbian as their native language, while no other language is represented in Croatia by more than 0.5% of native speakers among population of Croatia. Croatian is a member of the South Slavic languages of Slavic languages group, and is written using the Latin alphabet. There are three major dialects spoken on the territory of Croatia, with standard Croatian based on the Shtokavian dialect. The Chakavian and Kajkavian dialects are distinguished by their lexicon, phonology, and syntax.
Croatian replaced Latin as the official language of the Croatian government in the 19th century. In Yugoslavia, from 1972 to 1989, the language was constitutionally designated as "Croatian literary language". It was the result of the resistance to "Serbo-Croatian" in the form of a Declaration on the Status and Name of the Croatian Literary Language and Croatian Spring. Croatians are protective of their Croatian language from foreign influences and are known for Croatian linguistic purism, as the language was under constant change and threats imposed by previous rulers (i.e. Austrian German, Hungarian, Italian, and Turkish words were changed and altered to Slavic looking or sounding ones).
In response to the defeat at Podgorica, the Montenegrins formed tactical alliances with neighbouring Muslims tribes that were hostile to the Porte. By entering into such alliances Njegoš risked further alienating the Russians, whose support Montenegro still desperately needed. To neutralize any suspicion that Montenegro was acting against Russian interests, Njegoš cultivated a close personal friendship with vice-consul Grujić, who advised the czar that Njegoš was as dependable as ever. In one of his letters to Grujić, Njegoš reported that the final advice Petar I gave him before his death was "pray to God and hold on to Russia".
Kajkavian is spoken in North Croatia, including the capital Zagreb, as well as in a few enclaves in Austria, Hungary, and Romania. Though its speakers are ethnic Croats and Kajkavian is thus generally considered a dialect of Serbo-Croatian, it is closer to neighboring Slovene than it is to Chakavian or Shtokavian. The Kajkavian area of Croatia is bordered on the northwest by Slovene language territory. It is bordered on the east and southeast by Shtokavian dialects roughly along a line that was the former division between Civil Croatia and the Habsburg Military Frontier; in southwest along Kupa and Dobra rivers, it persisted in ancient (medieval) contact with Chakavian dialects.
It is considered that the Czech-Polish Croatian tribes were related to the Croatian tribes from Zakarpattia and Prykarpattia in Ukraine. They became separated during the migration period and seemingly formed one large Proto-Slavic tribe. It is theorized that the migration of those (White) Croatian tribes in the 7th century was the second and final Slavic migratory wave to the Balkans, which is related to the thesis by Bogo Grafenauer about the double migration of Slavs. According to this thesis, although it is possible that some Croatian tribes were present among Slavs in the first Slavic-Avar wave in the 6th century, it is argued that the Croatian migration in the second wave probably was not equally numerous to make a significant common-linguistical influence, while others considered they arrived in a significantly larger number. Zdenko Vinski and argued that the double migration thesis is supported by the rare findings of objects and ceramics of Prague-Korchak culture on the territory of Croatia, Bosnia and Herzegovina, and Serbia which were dated to the end of 6th and beginning of the 7th century (indicating first wave Slavs), and did not make a continuity with Slavic archaeological findings from the 8th-9th century, indicating assimilation. The Croatian tribes are also seen as a warrior group who assimilated into already present Slavs. In the territory of present-day Croatia they also gradually assimilated with the Pre-Slavic population because archaeology indicates a significant continuity of late antiquity population which have partially withdrawn to the mountains, coastal cities and islands.
Croatian replaced Latin as the official language of the Croatian government in 1847. The Croatian lect is generally viewed as one of the three standard varieties of the Shtokavian dialect of Serbo-Croatian, a South Slavic language. Croatian is written using the Latin alphabet and there are three major dialects spoken on the territory of Croatia, with the Shtokavian idiom used as the literary standard. The Chakavian and Kajkavian dialects are distinguished by their lexicon, phonology, and syntax.
The Croatian Coalition was the coalition of two Croat parties in Bosnia and Herzegovina, Croatian Democratic Union 1990 and Croatian Party of Rights of Bosnia and Herzegovina. This coalition was involved in Bosnia and Herzegovina general election, 2010 where it ran for seats and parliament and presidential election.
They main opposition was coalition which was formed by Croatian Democratic Union of Bosnia and Herzegovina, Croatian Peasant Party of Bosnia and Herzegovina - New Croatian Initiatieve and Croatian Party of Rights of Bosnia and Herzegovina.
Croatian tribes were like other Slavs polytheists - pagans. Their worldview intertwined with worship of power and war, to which raised places of worship, and demolished those of others. These worships were in contrast to Christianity, and conflict when Christianism became official ideology among the Slavs. The White Croats at the earliest historical sources are mentioned as pagans, and they were similar to the inhabitants of Kievan Rus' who also received Christianity late (988). Slavs often related places of worship with the natural environment, like hills, forests, and water. Some argue that Przemyśl was their as well as Slavic bishops capital in the 9th-century because there were uncovered foundations of a round chapel and palace made of cut stone. According to Nestor, Vladimir the Great in 980 raised on a hill near his fort pantheon of Slavic gods; Perun, Hors, Dažbog, Stribog, Simargl, and Mokosh, but as he converted to Christianity in 988 one of the probable reasons Vladimir attacked Croats in 992 was because they didn't want to abandon their old beliefs and accept Christianity. Some scholars derived Croatian ethnonym from the Iranian word for Sun - "hvar". Paščenko argued possibility that in the ethnonym of the Croats could be seen archaic religion and mythology - the worship of the Slavic solar deity Hors (Sun, heavenly fire, force, war), which is of Iranian origin.
As of 2009, the Italian language is officially used in twenty cities and municipalities and ten other settlements in Croatia, according to the European Charter for Regional or Minority Languages. It is an officially recognized minority language in Istria County, where it is spoken by 6.83% of the population on the aggregate and closer to 50% of the population in certain subdivisions.
The major cities in northern Croatia are located in what was historically a Kajkavian-speaking area, mainly Zagreb, Koprivnica, Krapina, Križevci, Varaždin, Čakovec. The typical archaic Kajkavian is today spoken mainly in Hrvatsko Zagorje hills and Međimurje plain, and in adjacent areas of northwestern Croatia where immigrants and the Štokavian standard had much less influence. The most peculiar Kajkavian dialect "(Baegnunski)" is spoken in Bednja in northernmost Croatia. Many of northern Croatian urban areas today are partly Štokavianized due to the influence of the standard language and immigration of Štokavian speakers.
The Democratic Movement of Serbia was formed in May 1992 as a political alliance made up primarily of SPO, New Democracy (ND), Democratic Party of Serbia (DSS). The political alliance however broke, and was dissolved in 1993. The SPO was part of the "Together" ("Zajedno") coalition in the 1996 parliamentary election which received 23.8% of the popular vote, losing to the Socialist Party of Serbia (SPS). In 1997, Drašković ran twice for president but finished third in both elections. Its party won the third largest number of seats in that year's Serbian parliamentary elections. A dissident group inside the party abandoned the SPO and formed New Serbia (NS) in 1997.
This situation was resolved on 11 February 1929, when the Lateran Treaty between the Holy See and the Kingdom of Italy was signed by Prime Minister and Head of Government Benito Mussolini on behalf of King Victor Emmanuel III and by Cardinal Secretary of State Pietro Gasparri for Pope Pius XI. The treaty, which became effective on 7 June 1929, established the independent state of Vatican City and reaffirmed the special status of Catholicism in Italy.
A 2011 survey revealed that 78% of Croatians claim knowledge of at least one foreign language. According to a survey ordered by the European Commission in 2005, 49% of Croatians speak English as the second language, 34% speak German, 14% speak Italian, and 10% speak French. Russian is spoken by 4% each, and 2% of Croatians speak Spanish. However, there are large municipalities that have minority languages that include substantial populations that speak these languages. An odd-majority of Slovenes (59%) have a certain level of knowledge of Croatian. The country is a part of various language-based international associations most notably the European Union Language Association.
In parallel, the Eastern Question grew more complex ever since the Ottoman defeat in the Russo-Turkish War (1768–1774). As the dissolution of the Ottoman Empire seemed imminent, the Great Powers struggled to safeguard their strategic and commercial interests in the Ottoman domains. The Russian Empire stood to benefit from the decline, whereas the Habsburg Empire and Britain perceived the preservation of the Ottoman Empire to be in their best interests. Meanwhile, the Serbian revolution (1804) and Greek War of Independence (1821) marked the beginning of the end of Ottoman rule in the Balkans, which ended with the Balkan Wars in 1912-1913. Formal recognition of the "de facto" independent principalities of Montenegro, Serbia and Romania ensued at the Congress of Berlin in 1878.
The Serbian revolution (1804–1815) marked the beginning of an era of national awakening in the Balkans during the Eastern Question. Suzerainty of Serbia as a hereditary monarchy under its own dynasty was acknowledged "de jure" in 1830. In 1821, the Greeks declared war on the Sultan. A rebellion that originated in Moldavia as a diversion was followed by the main revolution in the Peloponnese, which, along with the northern part of the Gulf of Corinth, became the first parts of the Ottoman empire to achieve independence (in 1829). By the mid-19th century, the Ottoman Empire was called the "sick man" by Europeans. The suzerain states – the Principality of Serbia, Wallachia, Moldavia and Montenegro – moved towards "de jure" independence during the 1860s and 1870s.
The Slovak Republic and the Czech Republic went their separate ways after 1 January 1993, an event sometimes called the Velvet Divorce. Slovakia has remained a close partner with the Czech Republic. Both countries co-operate with Hungary and Poland in the Visegrád Group. Slovakia became a member of NATO on 29 March 2004 and of the European Union on 1 May 2004. On 1 January 2009, Slovakia adopted the Euro as its national currency.
In 1585, traveler and writer Marco A. Pigaffetta, in his "Itinerario" published in London, states: "In Constantinople it is customary to speak Croatian, a language which is understood by almost all official Turks, especially military men." Crucially though, the "lingua franca" at the time among Slavic elites in the Ottoman Empire was still Old Church Slavonic. For Italians traveling through to Istanbul, the language of the Slavic Croats was often the only exposure they had to any of the Slavic languages; indeed, Bulgarian and Macedonian dialects were far more common in Istanbul than Croatian.
The bulk of the territory in dispute is in the vicinity of the town of Apatin, while the Island of Šarengrad and the Island of Vukovar are cited as particularly contentious parts of the dispute. Further disputed areas are located near the town of Bačka Palanka, and in the municipality of Sombor, at the tripoint of Croatia, Hungary and Serbia. Croatia claims that the cadastre-based boundary was adopted by the Đilas Commission, set up in 1945 to determine the borders between federal constituents of Yugoslavia, while Serbia claims that the same commission identified the boundary as the course of the Danube in 1945. In 1991, the Arbitration Commission of the Peace Conference on Yugoslavia ruled that the border between federal units of Yugoslavia became inviolable international borders, without referring to locations of any specific claim or line. The opinion was rendered at the request of Serbia. Prior to the ruling, Serbia asserted that the borders were subject to change following the breakup of Yugoslavia and the independence of Croatia. Since the Croatian War of Independence, the line of control coincides with the Serbian claim.
Milošević rejected the independence of Croatia in 1991, and even after the formation of the Federal Republic of Yugoslavia (FRY), it too did not initially recognize Croatia's independence. Plans by Milošević to carve out territory from Croatia to the local Serbs had begun by June 1990, according to the diary of Borisav Jović. The Serbian government along with a clique of pro-Milošević members of the Yugoslav army and its general staff, secretly adopted the RAM or "frame" plan that involved the partition of Croatia and Bosnia to give large amounts of territory to the local Serbs that would remain united with Serbia, effectively a Greater Serbia. Armaments and military equipment were placed in strategic positions throughout Croatia and Bosnia for use by the Serbs and local Serbs were trained as police and paramilitary soldiers in preparation for war. Milošević was less interested in annexing the Serb breakaway republic of Krajina. According to testimony by Krajina's former President Milan Babić, Milošević had abandoned plans of having "all Serbs in one state" by March 1991 in the secret Karađorđevo agreement with Croatian President Franjo Tuđman that discussed the partition of Bosnia. Babić attended the meeting and noted that Milošević stated that "Tuđman needs Bihać" – a city in Bosnia that was separated by Serbian Krajina from Croatian government-controlled territory in Croatia; and then added "He needs a road between Benkovac and Drniš as well" that would involve the road going through territory claimed by Krajina.
During the war between the Byzantium and Bulgaria of Simeon I, in about 923, the Byzantines concluded an alliance with Croatia. Prior to that the Bulgarians had several decisive victories against the Byzantines, capturing Adrianople and endangering Constantinople. In 924 Simeon I deposed Zaharija from rule in Serbia, who fled to Croatia. In 926, Simeon's troops invaded Croatia, but were severely defeated in the Battle of the Bosnian Highlands. In 927 Pope John X sent his legates to mediate a peace treaty between Croats and Bulgarians.
On April 7, 2016 Croatia refused to endorse the EU Commission opinion to open Chapter 23, a part of Serbia’s EU accession negotiations, thus effectively blocking Serbia’ EU integration process. Serbia accused Croatia of obstructing its EU membership, and Vučić said that his government was: ""Stunned by Croatia's decision not to support Serbia's European path.""
Croatia has not agreed for Serbia to open negotiations of Chapter 23. 
On April 14, 2016, the EU Commission rejected Croatian arguments in its dispute with Serbia. However, on July 7, 2016, Croatian Foreign Minister Miro Kovač announced that five conditions set by Croatia have been incorporated in the common position of the EU member states for negotiations with Serbia which will be the basis on which Serbia's progress in Chapter 23, concerning the judiciary and fundamental rights, will be assessed. These five conditions are: Serbia has to: 1. steer clear of conflicts of jurisdiction concerning war crimes, 2. cooperate with neighboring countries in search and identification of missing persons or their remains, 3. strengthen its investigative, prosecution, and judicial authorities, 4. strengthen protection of (Croatian) minority, and 5. fully cooperate with the ICTY.