of being treated as second-class citizens. Belgrade, the capital of SFR Yugoslavia and SR Serbia, hosted the first Non-Aligned Movement Summit in September 1961, as well as the first major gathering of the Organization for Security and Co-operation in Europe (OSCE) with the aim of implementing the Helsinki Accords from October 1977 to March 1978. The 1972 smallpox outbreak in SAP Kosovo and other parts of SR Serbia was the last major outbreak of smallpox in Europe since World War II. Breakup of Yugoslavia and political transition In 1989, Slobodan Milošević rose to power in Serbia. Milošević promised a reduction of powers for the autonomous provinces of Kosovo and Vojvodina, where his allies subsequently took over power, during the Anti-bureaucratic revolution. This ignited tensions between the communist leadership of the other republics of Yugoslavia and awoke ethnic nationalism across Yugoslavia that eventually resulted in its breakup, with Slovenia, Croatia, Bosnia and Herzegovina, and Macedonia declaring independence during 1991 and 1992. Serbia and Montenegro remained together as the Federal Republic of Yugoslavia (FRY). However, according to the Badinter Commission, the country was not legally considered a continuation of the former SFRY, but a new state. Fueled by ethnic tensions, the Yugoslav Wars (1991–2001) erupted, with the most severe conflicts taking place in Croatia and Bosnia, where the large ethnic Serb communities opposed independence from Yugoslavia. The FRY remained outside the conflicts, but provided logistic, military and financial support to Serb forces in the wars. In response, the UN imposed sanctions against Yugoslavia which led to political isolation and the collapse of the economy (GDP decreased from $24 billion in 1990 to under $10 billion in 1993). Serbia was in the 2000s sued on the charges of alleged genocide by neighbouring Bosnia and Herzegovina and Croatia but in both cases the main charges against Serbia were dismissed. Multi-party democracy was introduced in Serbia in 1990, officially dismantling the one-party system. Critics of Milošević stated that the government continued to be authoritarian despite constitutional changes, as Milošević maintained strong political influence over the state media and security apparatus. When the ruling Socialist Party of Serbia refused to accept its defeat in municipal elections in 1996, Serbians engaged in large protests against the government. In 1998, continued clashes between the Albanian guerilla Kosovo Liberation Army and Yugoslav security forces led to the short Kosovo War (1998–99), in which NATO intervened, leading to the withdrawal