The post-Soviet states, also referred to as the former Soviet Union (FSU) or the former Soviet republics, are the independent sovereign states that emerged/re-emerged out of the dissolution of the Soviet Union in 1991. Prior to their independence, they existed as Union Republics — top-level constituents of the Soviet Union. There are 15 post-Soviet states in total: Armenia, Azerbaijan, Belarus, Estonia, Georgia, Kazakhstan, Kyrgyzstan, Latvia, Lithuania, Moldova, Russia, Tajikistan, Turkmenistan, Ukraine, and Uzbekistan. Each of these countries succeeded their respective Union Republics: the Armenian SSR, the Azerbaijan SSR, the Byelorussian SSR, the Estonian SSR, the Georgian SSR, the Kazakh SSR, the Kirghiz SSR, the Latvian SSR, the Lithuanian SSR, the Moldavian SSR, the Russian SFSR, the Tajik SSR, the Turkmen SSR, the Ukrainian SSR, and the Uzbek SSR. In Russia, the term "near abroad" (ближнее зарубежье bližneye zarʉbežye) is sometimes used to refer to other post-Soviet states.
Following the end of the Cold War, the international community de facto recognized Russia as the successor state to the Soviet Union as a whole, rather than to just the Russian SFSR. In contrast, the other post-Soviet states were recognized as successors only to their corresponding Union Republics. However, Russia's status as the sole legitimate successor in this capacity has been disputed by Ukraine, which has proclaimed by law that it is the successor state to both the Ukrainian SSR and the Soviet Union as a whole. The question of whether Russia or Ukraine succeeded the Soviet Union in 1991 arose due to a comprehensive dispute between the two countries over what had been collective Soviet state-owned properties, now divided by the Russia–Ukraine border.
The Union Republics of the Baltic states (Estonia, Latvia, Lithuania) were the first to break away from the Soviet Union by proclaiming the restoration of their national independence between March and May 1990; they cited legal continuity from the original Baltic states, asserting that Baltic sovereignty had continued on a de jure basis due to the belligerent nature of the 1940 Soviet annexation.