Why did Moscow Bolshevik empire want to colonize Afghanistan ? And Why have they lost ?

[Litwin]

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“While the Bolshevik imperialists expected to be greeted as liberators, what they found was the Afghan People United against them.”
In 1984, the Grandfather wrote “don’t tell mom I’m in Afghanistan.”
Then, in 1994 the Father wrote “don’t tell mom I’m in Chechnya.”
Now, in 2024, the son writes “don’t tell mom I’m in Ukraine.”
so, Why did Moscow Bolshevik empire want to colonize Afghanistan ? And Why have they lost ?

Atrocity crimes in the Soviet–Afghan War - Wikipedia

en.wikipedia.org

The war resulted in the deaths of between 1,000,000[66] and 3,000,000 Afghans.[5] Civilian death and destruction from the war was massive and detrimental. Estimates of Afghan civilian deaths vary from 562,000[6] to 2,000,000.[7][8]