Question: Who did Anna Timiryova marry after Alexander Kolchak was executed?

Context paragraphs:
The Admiral (2008 film): The Admiral (Russian: Адмиралъ Admiral) is a 2008 biopic about Alexander Kolchak, a vice-admiral in the Imperial Russian Navy and leader of the anti-communist White Movement during the Russian Civil War.  The film also depicts the love triangle between the Admiral, his wife, and the poet Anna Timiryova.

Ren Fuchen: Ren Fuchen (; April 1884 – November 1918) was a Chinese member of the Bolshevik party and a commander of a Chinese regiment of the Soviet Red Army during the Russian Civil War.  He joined the Bolsheviks in 1908.  He was killed in action during a battle against the White Army forces of Alexander Kolchak.  He was known as "China's first Bolshevik".  In the aftermath of the Russian Revolution, he raised a regiment of 1,500 Chinese expatriates for the Soviet cause.  He was killed in November 1918.  The Soviet Union awarded him a Red Flag medal in November 1989, and a statue of him was erected in Tieling, his hometown, in 1993.

The White Horse (series): The White Horse is a Russian TV serial broadcast in 1993.  The film, in 10 episodes, was directed by Gelii Ryabov.  It presents the Russian civil war in Siberia from 1917–1920 and the struggle of the White Russians under the command of Admiral Alexander Kolchak against the Bolshevik forces, until his final defeat.

Spring Offensive of the Russian Army (1919): The Spring Offensive of the Russian Army was an offensive of the Russian Army of the White movement led by Alexander Kolchak on the Eastern Front of the Russian Civil War between March and April 1919.

Alexander Kolchak: Alexander Vasilyevich Kolchak CB (Russian: Алекса́ндр Васи́льевич Колча́к , 16 November [O.S. 4 November] 1874 – 7 February 1920) was a polar explorer and commander in the Imperial Russian Navy, who fought in the Russo-Japanese War and the First World War.  During the Russian Civil War, he established an anti-communist government in Siberia—later the Provisional All-Russian Government—and was recognised as the "Supreme Ruler and Commander-in-Chief of All Russian Land and Sea Forces" by the other leaders of the White movement from 1918 to 1920.  His government was based in Omsk, in southwestern Siberia.

Anna Timiryova: Anna Vasilyevna Timiryova (Russian: Анна Васильевна Тимирёва ; July 18, 1893 Kislovodsk - January 31, 1975 Moscow) was a Russian poet.  Born Anna Safonova, she was the daughter of composer Vasily Ilyich Safonov.  At age 19 she married admiral Sergey Nikolayevich Timiryov, whom she divorced in 1918 to join her lover, Admiral Alexander Kolchak.  After Kolchak's execution, she was arrested several times.  In 1923 she married Vsevolod Kniper.  She was the mother of the painter Vladimir Sergeyevich Timiryov

Order of St. George: The Order of Saint George (Russian: Орден «Святого Георгия» ) is today the highest purely military decoration of the Russian Federation.  Originally established November 26, 1769 as the highest military decoration of the Russian Empire by Empress Catherine the Great.  After the 1917 Russian Revolution it was awarded by the White movement anti-communist forces under Alexander Kolchak until their collapse in 1921.  The order was revived in the Russian Federation on August 8, 2000 by Decree №1463 of the President of Russia.  The current award criteria were amended on September 7, 2010 by Presidential Decree 1099.

Russian polar expedition of 1900–02: The Russian polar expedition of 1900–1902 was commissioned by the Saint Petersburg Academy of Sciences to study the Arctic Ocean north of New Siberian Islands and search for the legendary Sannikov Land.  It was led by the Russian geologist and Arctic explorer Baron Eduard Toll on the ship "Zarya".  Toll and his three assistants vanished in late 1902 while exploring Bennett Island.  One of the key members of the expedition was Alexander Kolchak, then a young researcher and lieutenant of the Russian Navy, and later a ruler of Russia.

Canadian Siberian Expeditionary Force: The Canadian Siberian Expeditionary Force (also referred to as the Canadian Expeditionary Force (Siberia) or simply C.S.E.F.) was a Canadian military force sent to Vladivostok, Russia, during the Russian Revolution to bolster the allied presence, oppose the Bolshevik revolution and attempt to keep Russia in the fighting against Germany.  Composed of 4,192 soldiers and authorised in August 1918, the force returned to Canada between April and June 1919.  The force was commanded by Major General James H. Elmsley.  During this time, the C.S.E.F. saw little fighting, with fewer than 100 troops proceeding "up country" to Omsk, to serve as administrative staff for 1,500 British troops aiding the anti-Bolshevik White Russian government of Admiral Alexander Kolchak.  Most Canadians remained in Vladivostok, undertaking routine drill and policing duties in the volatile port city.

Russian rescue expedition of 1903: The Russian rescue expedition of 1903 was commissioned by the Saint Petersburg Academy of Sciences to rescue the groups of Baron Eduard Toll and Alexei Byalynitsky-Birulya that were left near New Siberian Islands by the Russian polar expedition of 1900–1902.  The expedition was organized and led by Alexander Kolchak, then a young researcher and lieutenant of the Russian Navy, and later a ruler of Russia.

Supporting paragraphs: Anna Timiryova Alexander Kolchak
Answer: Vsevolod Kniper