Answer the following question: Information: - Kremenets (translit. "Kremenets") is a city of regional significance in the Ternopil Oblast (province) of western Ukraine. It is the administrative center of the Kremenets Raion (district), and rests 18km north-east of the great Pochayiv Monastery. The city is situated in the historic region of Volhynia. - Kremenets Raion is a raion (district) in Ternopil Oblast of western Ukraine. The administrative center is the city of Kremenets. - Ukraine (tr. ) is a sovereign state in Eastern Europe, bordered by Russia to the east and northeast, Belarus to the northwest, Poland and Slovakia to the west, Hungary, Romania, and Moldova to the southwest, and the Black Sea and Sea of Azov to the south and southeast, respectively. Ukraine is currently in territorial dispute with Russia over the Crimean Peninsula which Russia annexed in 2014 but which Ukraine and most of the international community recognise as Ukrainian. Including Crimea, Ukraine has an area of , making it the largest country entirely within Europe and the 46th largest country in the world. It has a population of about 44.5 million, making it the 32nd most populous country in the world. - Kiev or Kyiv is the capital and largest city of Ukraine, located in the north central part of the country on the Dnieper River. The population in July 2015 was (though higher estimated numbers have been cited in the press), making Kiev the 7th most populous city in Europe. - Ternopil Oblast (translit. "Ternopilska oblast"; also referred to as Ternopilshchyna - "") is an oblast (province) of Ukraine. Its administrative center is Ternopil, through which flows the Seret River, a tributary of the Dnister. - Volhynia, Volynia, or Volyn ("Volyn", , "Volyn" or ' , or ' (Volhynian German: "Wolhinien" or "Wolinien")) is a historic region in Central and Eastern Europe straddling Poland, Ukraine, and Belarus. The alternate name for the region is Lodomeria after the city of Volodymyr-Volynsky (Vo-Lodymer), which once was a political capital of the medieval Volhynian Principality. It has changed hands numerous times throughout history and been divided among competing powers. Since the fall of the Soviet Union in 1991, it has been part of the independent nation of Ukraine. - Western Ukraine or West Ukraine is a geographical and historical relative term used in reference to the western territories of Ukraine. Important cities are Buchach, Chernivtsi, Drohobych, Halych (hence - Halychyna), Ivano-Frankivsk, Khotyn, Lutsk, Lviv, Mukacheve, Rivne, Ternopil, Uzhhorod and others. Western Ukraine is not an administrative category within Ukraine. It is defined mainly in the context of European history pertaining to the 20th century wars and the ensuing period of annexations. The current oblast administration borders are almost perfectly aligned with the administrative divisions of the Second Polish Republic from before the 1939 invasion of Poland by the Soviet Union. At the onset of World War II the region was incorporated into the Ukrainian Soviet Socialist Republic (), following mock elections which manufactured public consent for the transfer of land from occupied Poland to the Soviet Union as of October 22, 1939. Its historical background makes Western Ukraine uniquely different from the rest of the country, and contributes to its distinctive character of today. - Dmitriy Manuilsky , or Dmytro Zakharovych Manuilsky ( 3 October 1883 in Sviatets near Kremenets -- 22 February 1959 in Kiev ) was an important Bolshevik . - The Dnieper River or (also known as: "Dnepr", "Dnyapro" or "Dnipro") is one of the major rivers of Europe (fourth by length), rising near Smolensk, Russia and flowing through Russia, Belarus and Ukraine to the Black Sea. It is the longest river of Ukraine and Belarus and the fourth longest river in Europe. The total length ranges between and with a drainage basin of . The river is noted for its dams and hydroelectric stations. The Dnieper is an important navigable waterway for the economy of Ukraine and is connected via the DnieperBug Canal to other waterways in Europe. Given the information above, choose from the list below the object entity that exhibits the relation 'country of citizenship' with the subject 'dmitry manuilsky'. Choices: - belarus - moldova - poland - russia - slovakia - soviet union - ukraine - ukrainian soviet socialist republic
Answer:
soviet union