There are many reasons that why Russians were in Afghanistan:
after loosing creamian war in 1853-56 Russians learned a lesson and started making strong their country.
when in 1815 Russia defeated Napolean in the battle of water loo then it rose as a strong power. it started expanding its territory and extended till Amu Darya(Oxus river). Afghanistan could be the next victim but British stopped her way. In 1893 Russia recognized British supremacy on Afghanistan. when British exit from India then Russians found the ground free for their politics. the other superpower was far away and did not show any interest in this region.
from 1964 beforethe formation of PDPA Afghanistan was the only country where there was no communist party as all neighbours of Soviet Union had it. when after the coup d'etat in 1978 in actual communist party came for ruling. Later Amin tried to lessen Russian influence from Afghanistan but the roots were strong. no one can move them. when Russian saw the plant of communism has a threat in Afghanistan they invaded for its rescue.
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Because Russians are losers and no matter what they tried with their high tech(at the time) machines and weapons and the Afghans fighting with rocks, swords, and home made bombs, they still lost! Hah! It's because Allah(god) was on our side:) ~Afg4life
the communist regime in Afghanistan was about to be overthrown by Muslim guerrilla fighters called the "mudjahadeen". the soviets rushed to the aid to save the communist government.
Iran v Iraq war stopped. Russia started to leave Afghanistan
Russia Attacked Afganistan or precisely mujahideen in Afghanistan in 1979 and war went on till 1989.
Russia colonized by Slavian tribes
The Soviet Union invaded Afghanistan in 1979.
10 years, 1979 entered and the last russian out was in 1989