Which country has experienced the most extreme "balkanization" since the dissolution of the Soviet Union?

Georgia

Explanation:

Balkanization is a term that refers to the partition or fragmentation of a state or territory into smaller places, usually similar in their ethnicity. It also refers to ethnic conflicts between states of different ethnicities.

After the Soviet Union collapsed, many countries were created, Georgia being one of them. This is the country that has experienced the most extreme balkanization because various separatist movements originated after it in Abkhazia and South Ossetia, located in Georgia's borders. As a result, the Georgian army took action in these regions.