You’re a big fat liar. The Russian people got tired of seeing their sons killed in Afghanistan for nothing.
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Russian loses about 30000 in car crushes alone each year but soviet army casualties were 15 thousands on 300 millions of teh population of USSR.
SO I do not say that those casualties in Afganistan were unnnoticed but they were far from the level to protest. I presume that the population of Afganistan would run out early then any protest of soviet army casualties gathered momentum.
So it wasn’t no casualties which stopped Soviet-Afgan war but just the senselessness of the depopulating of Afganistan.