How is the war in Afghanistan a drain on Soviet resources?

The war in Afghanistan caused a drain on Soviet resources because they lost billions of dollars and about 15,000 personnel in troops.

Between 1979 to 1989, Soviet Union under the leadership of President Mikhail Gobarchev, invaded the territory of Afghanistan in the hope to control the area to their advantage. However, over the nine years of invasion, USSR could not totally win the war, and thereby lost money, troops and image to the world at large.

USSR troops eventually left the country in 1989.

Hence, in this case, the war in Afghanistan caused a drain on Soviet resources because they lost billions of dollars and about 15,000 personnel in troops.

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