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

Vincent van Gogh, Biography, Art, & Facts

The Power of Van Gogh's Nature - WSJ

How Van Gogh paid for his mentally ill sister's care decades after his death, Vincent van Gogh

The Last Self-Portraits Made By Picasso, Van Gogh, and More

Why did people dislike Van Gogh's paintings during his lifetime? - Quora

Was 'The Red Vineyard' really the only painting van Gogh ever sold?

Hidden Van Gogh self-portrait found behind another painting

10 Famous Nature Artists & Their Work

Previously hidden Van Gogh painting sells for $15 million

Vincent van Gogh, The Potato Peeler (reverse: Self-Portrait with a Straw Hat)