How did the only painting sold by Van Gogh in his lifetime end up in Russia?

Vincent van Gogh: A Life in Letters review — Van Gogh in his own words

Van Gogh was not unappreciated in his lifetime, myth-busting letter shows

Is 'The Red Vineyard' Vincent van Gogh's only known painting sold? - Daily Times

Top 5 Most Famous Paintings of Vincent van Gogh in Different Subjects

8 Little-known Masterpieces by Vincent van Gogh

Copies by Vincent van Gogh - Wikipedia

A Clue to van Gogh's Final Days Is Found in His Last Painting - The New York Times

The 35 Most Expensive Paintings Ever Sold

The Mystery of the Disappearing van Gogh - The New York Times