The fall of communism in Eastern Europe led to the dissolution of the Soviet Union and Yugoslavia in the early 1990s. Mikhail Gorbachev's policies of glasnost and perestroika weakened Soviet control over Eastern Europe and republics sought independence. Ethnic tensions and violence erupted in Yugoslavia as Serbia's Slobodan Milosevic attempted to dominate the republics. Wars broke out in Croatia, Bosnia, and Kosovo as Milosevic carried out ethnic cleansing campaigns against non-Serbs. By 1991, the Soviet Union collapsed and Russia emerged as the dominant successor state led by Boris Yeltsin and later Vladimir Putin.