Information:  - The Black Sea is a body of water between Eastern Europe and Western Asia, bounded by Bulgaria, Georgia, Romania, Russia, Turkey, and Ukraine. It is supplied by a number of major rivers, such as the Danube, Dnieper, Rioni, Southern Bug, and Dniester. The Black Sea has an area of (not including the Sea of Azov), a maximum depth of , and a volume of . It is constrained by the Pontic Mountains to the south and by the Caucasus Mountains to the east, and features a wide shelf to the northwest. The longest east-west extent is about .  - Krasnodar Krai is a federal subject of Russia (a krai), located in the Southern Federal District. Its administrative center is the city of Krasnodar. It had a population of 5,226,647 (2010 Census).  - 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.  - Russia (from the  Rus'), also officially known as the Russian Federation, is a country in Eurasia. At , Russia is the largest country in the world by surface area, covering more than one-eighth of the Earth's inhabited land area, and the ninth most populous, with over 140 million people at the end of March 2016. The European western part of the country is much more populated and urbanised than the eastern, about 77% of the population live in European Russia. Russia's capital Moscow is one of the largest cities in the world, other major urban centers include Saint Petersburg, Novosibirsk, Yekaterinburg, Nizhny Novgorod and Samara.  - 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.  - Pavel Davidovich Kogan ( Russian :    ; 7 July 1918 , Kiev -- 23 September 1942 , near Novorossiysk ) was a Jewish Soviet poet who died fighting as a soldier in the Second World War .  - 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.  - Novorossiysk is a city in Krasnodar Krai, Russia. It is the country's main port on the Black Sea and the leading Russian port for exporting grain. It is one of the few cities honored with the title of the Hero City. Population:   - Hero City is a Soviet honorary title awarded for outstanding heroism during World War II (Eastern Front was known in the former Soviet Union as The Great Patriotic War). It was awarded to twelve cities of the Soviet Union. In addition the Brest Fortress was awarded an equivalent title of Hero Fortress. This symbolic distinction for a city corresponds to the individual distinction Hero of the Soviet Union.    After reading the paragraphs above, we are interested in knowing the entity with which 'pavel kogan ' exhibits the relationship of 'country of citizenship'. Find the answer from the choices below.  Choices: - belarus  - bulgaria  - earth  - georgia  - poland  - russia  - slovakia  - soviet union  - turkey  - ukraine
Answer:
soviet union