Question: How long is the border between Kazakhstan and the country that the spouse of Kseniya Boguslavskaya is from?

full_context: Document 1: Dan Petrașincu: He was born in Odessa from an Italian father and a Romanian mother. In the aftermath of the Russian Revolution, when he was ten years old, the family fled to Romania, where he went to high school in Râmnicu Sărat and Bucharest.
Document 2: Andrei Ivanovitch: Andrei Ivanovitch (born 1968 in Bucharest, Romania) is an international classical pianist and winner of a number of international competitions.
Document 3: Bolesław Leśmian: Bolesław Leśmian was born January 22, 1877 in Warsaw, Congress Poland, Russian Empire to a family of Polonized Jewish intelligentsia. He spent his childhood and youth in Kiev, where he graduated from the law faculty of Saint Vladimir University. In 1901, he returned to Warsaw. From there, he set off on a journey to various European cities, including Munich and Paris, where he married a painter, Zofia Chylińska. Heavily influenced by French modernists, Leśmian returned to Warsaw, where he became one of the founders of an experimental "Artistic Theatre". There he also met one of his closest friends, Zenon Przesmycki, with whom he became involved in the publication of "Chimera", an art newspaper.
Document 4: Ivan Koumaev: Koumaev was born in Khabarovsk, Russia and moved to Mill Creek, Washington when he was seven years old. He started dancing at age 11 training under Kimera Lewis, after watching the film "Breakin'".
Document 5: Geography of Russia: Truly alpine terrain appears in the southern mountain ranges. Between the Black and Caspian seas, the Caucasus Mountains rise to impressive heights, forming a boundary between Europe and Asia. One of the peaks, Mount Elbrus, is the highest point in Europe, at 5,642 meters. The geological structure of the Caucasus extends to the northwest as the Crimean and Carpathian Mountains and southeastward into Central Asia as the Tian Shan and Pamirs. The Caucasus Mountains create an imposing natural barrier between Russia and its neighbors to the southwest, Georgia and Azerbaijan.
Document 6: Nora Gal: She was born on April 27, 1912 in Odessa. Her father was a medical doctor. As a child, she moved to Moscow with her family. After several unsuccessful attempts she was admitted to the Lenin Pedagogical Institute, from which she graduated. She then completed her post-graduate studies with a thesis on the French poet Arthur Rimbaud and published articles on classical and contemporary foreign literature (Guy de Maupassant, Byron, Alfred de Musset). She married literary critic Boris Kuzmin and later became editor of his selected works.
Document 7: Russia: Russia (/ ˈrʌʃə / (listen); Russian: Росси́я, tr. Rossiya; IPA: (rɐˈsjijə)), also officially known as the Russian Federation (Russian: Российская Федерация, tr. Rossiyskaya Federatsiya; IPA: (rɐˈsijskəjə fjɪdjɪˈratsɨjə)), is a country in Eurasia. At 17,125,200 square kilometres (6,612,100 sq mi), 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 144 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, Chelyabinsk, Nizhny Novgorod, Ufa, and Kazan.
Document 8: Lev Kublanov: Lev Kublanov was born in Moscow, Russia, and spent his childhood in a historic neighborhood near the Red Square. He graduated from the Moscow Architectural Institute in 1972; he consequently worked for 20 years in various Moscow architectural design firms and became a member of the Architects’ Union of the USSR. He has been a member of the International Union of Architects since 1981. In 1985, tired of designing monotonous mass-apartment buildings and offices, Kublanov left architecture to become a graphic artist. Since then, he has participated in personal and group exhibitions in Russia, Western Europe, and USA. His works can be found in private collections all over the world, including Russia, Austria, Hungary, Germany, USA, Israel, Italy, Poland, France and Japan.
Document 9: Central Asia: Mentioned five countries of so called ``Central Asia ''region are situated far from the geographical midpoint of Asia in Russian Southern Siberia, the largest country of the`` Central Asia'' region - Kazakhstan - is partially out of Asia in Europe. Central Asia has a population of about 70 million, consisting of five republics: Kazakhstan (pop. 18 million), Kyrgyzstan (6 million), Tajikistan (9 million), Turkmenistan (6 million), and Uzbekistan (31 million). Afghanistan (pop. 35 million), which is a part of South Asia, is also sometimes included in Central Asia, as is Mongolia (pop. 3 million), which is part of East Asia.
Document 10: Kseniya Boguslavskaya: Born in St. Petersburg, she studied art in Paris from 1911 to 1913. She returned to St. Petersburg in 1913 and married Ivan Puni. Their apartment in St Petersburg became a meeting place for avant-garde artists and poets. With Puni she published the cubo-futurist booklet "Roaring Parnassus" («Рыкающий Парнас») in 1914.
Document 11: Marius Petipa: Marius Ivanovich Petipa (Russian: Ма́риус Ива́нович Петипа́), born Victor Marius Alphonse Petipa (11 March 1818 -- 14 July (O.S. 1 July) 1910) was a French and Russian ballet dancer, pedagogue and choreographer. Petipa is considered to be the most influential ballet master and choreographer in ballet history.
Document 12: Kazakhstan: It shares borders of 6,846 kilometres (4,254 mi) with Russia, 2,203 kilometres (1,369 mi) with Uzbekistan, 1,533 kilometres (953 mi) with China, 1,051 kilometres (653 mi) with Kyrgyzstan, and 379 kilometres (235 mi) with Turkmenistan. Major cities include Nur-Sultan, Almaty, Karagandy, Shymkent, Atyrau, and Oskemen. It lies between latitudes 40° and 56° N, and longitudes 46° and 88° E. While located primarily in Asia, a small portion of Kazakhstan is also located west of the Urals in Eastern Europe.Kazakhstan's terrain extends west to east from the Caspian Sea to the Altay Mountains and north to south from the plains of Western Siberia to the oases and deserts of Central Asia. The Kazakh Steppe (plain), with an area of around 804,500 square kilometres (310,600 sq mi), occupies one-third of the country and is the world's largest dry steppe region. The steppe is characterised by large areas of grasslands and sandy regions. Major seas, lakes and rivers include the Aral Sea, Lake Balkhash and Lake Zaysan, the Charyn River and gorge and the Ili, Irtysh, Ishim, Ural and Syr Darya rivers.
Document 13: Ivan Puni: Ivan Puni was born in Kuokkala (then Grand Duchy of Finland in the Russian Empire, now Repino in Russia) to a family of Italian origins. He is the grandson of an eminent Italian composer of ballet music, Cesare Pugni.
Document 14: Kazakhstan: With an area of 2,700,000 square kilometres (1,000,000 sq mi) – equivalent in size to Western Europe – Kazakhstan is the ninth-largest country and largest landlocked country in the world. While it was part of the Soviet Union, Kazakhstan lost some of its territory to China's Xinjiang autonomous region and some to Uzbekistan's Karakalpakstan autonomous republic.
Document 15: Alice Halicka: Alicja Halicka was born in Kraków and studied with Józef Pankiewicz there. She moved to Paris in 1912 where she studied at Académie Ranson under Paul Sérusier and Maurice Denis. There she met and married the Cubist painter Louis Marcoussis in 1913. In 1921 she showed cubist work together with her husband at the Société des Artistes Indépendants. She also exhibited her work at the Galerie Georges Petit, Paris (1930-31), Le Centaure, Brussels, the Leicester Galleries, London (1934), the Marie Harriman Gallery, New York (1936), Julian Levy Gallery, New York (1937). Halicka painted in various styles but also produced work in fabric, including Romances capitonnées, and even made set designs for ballets which were performed at the Metropolitan Opera of New York and Covent Garden, London.
ground_truth: 6,846 kilometres
sub_queries: Kseniya Boguslavskaya >> spouse Answer: Ivan Puni
What country is Ivan Puni from? Answer: Russia
How long is the border with Russia ? Answer: 6,846 kilometres