Research topics below this in the hierarchy
- Ukraine
- Early to 1613
- House of Romanov, 1613-1917
- Revolution, 1917-1921
- Soviet regime, 1918-1991
- 1991-
- Baltic States
- Estonia
- Latvia
- Lithuania
- Belarus. Byelorussian S.S.R. White Russia
- Southern Soviet Union
- Moldova. Moldovian S.S.R. Bessarabia
- Russia (Federation). Russian S.F.S.R.
- Georgia (Republic). Georgian S.S.R. Georgian Sakartvelo
- Armenia (Republic). Armenian S.S.R.
- Azerbaijan. Azerbaijan S.S.R.
- Siberia
- Soviet Central Asia. West Turkestan
- Kazakhstan. Kazakh S.S.R.
- Kyrgyzstan. Kirghiz S.S.R. Kirghizia
- Tajikistan. Tajik S.S.R. Tadzhikistan
- Turkmenistan. Turkmen S.S.R. Turkmenia
- Uzbekistan. Uzbek S.S.R.
- Poland