Which of these countries was not previously part of the former Soviet Union?

The post-Soviet states, also known as the former Soviet Union, are the 15 sovereign states that emerged and re-emerged from the Union of Soviet Socialist Republics following its breakup in 1991.

The post-Soviet states in English alphabetical order are:

Armenia, Azerbaijan, Belarus, Estonia, Georgia, Kazakhstan, Kyrgyzstan, Latvia, Lithuania, Moldova, Russia, Tajikistan, Turkmenistan, Ukraine and Uzbekistan.

The three Baltic states (Estonia, Latvia, and Lithuania) were the first to declare their independence, between March and May 1990. The remaining 12 republics all subsequently seceded.

Slovenia is a country located in Central Europe at the crossroads of main European cultural and trade routes. It is bordered by Italy to the west, Austria to the north, Hungary to the northeast, Croatia to the southeast, and the Adriatic Sea to the southwest. It was never part of the former Sviet Union.

Most of the former Soviet states began the transition to a market economy from a command economy. The process triggered severe economic declines, with Gross Domestic Product (GDP) dropping by more than 40% overall between 1990 and 1995. This decline in GDP was much more intense than the 27% decline that the United States suffered in the wake of the Great Depression between 1930 and 1934.

The economic shocks associated with wholesale privatization resulted in the excess deaths of roughly 1 million working age individuals throughout the former Soviet bloc in the 1990s.