The most severe conflict in 1990 took place in Balkan republic of ______.

Yugoslavia

The correct answer is Option 3 - Yugoslavia

The most severe conflict in 1990 took place in Balkan republic of Yugoslavia.

Following the disintegration of the USSR, in Eastern Europe, Czechoslovakia split peacefully into two, with the Czechs and the Slovaks forming independent countries. But the most severe conflict took place in the Balkan republics of Yugoslavia. After 1991, it broke apart with several provinces like Croatia, Slovenia and Bosnia and Herzegovina declaring independence. Ethnic Serbs opposed this and a massacre of non-Serb Bosnians followed. The NATO intervention and the bombing of Yugoslavia followed the inter-ethnic civil war.