"Oh, my. Just follow what you preach. At least sometimes. At least try." So in 1989, the Soviets went, then in 1993, the Afghan government fall, so this is a Russian defeat... Sure... I would say that it is a political defeat, but certainly not a military defeat, and had nothing to do with how the Soviets managed or not the military operations.

"the Soviets withdrew from Afghanistan and never returned and the regime they had installed collapsed very soon. Now whose victory it was?" You link 2 proposals as they are real. The Soviets withdraw from Afghanistan. They never returned (they vanish in history, but I see your point). The victory of the Mujaheddin was against the Afghan Government.
With the same kind of "logic" I can say then Mullah Omar won, then the USA were attacked and lost the war in Iraq to ISIL. Whose victory it is? The Soviet Union?

"Like I said: a color-blind person claims that there is no such a thing as red dawn just because he never saw one.
If you can't tell by sight the difference between Caucasians, mongolean-type asians and Europeans (i.e. Russians and Ukrainians living in Donbas), don't claim there IS no difference. Live and learn, you know." Err, your point is? Apart a special gift in racism, I mean? The fact is your genes don't determines where you live or your nationality.

"We were talking about RUSSIAN (then the Soviet) INVOLVEMENT IN WARS DOWN SOUTH AND THEIR ABILITY TO HANDLE THEM" And in all specialist books I read, including from high ranking personnels in USA army and Intelligence, they all agree they were quite successful.
Just in case you forgot: I have no sympathy for the Red Army. At the time I was in the Army, we were trained to face the Red Storm, with a life expectancy of 15 minutes after first encounter, and as member of an Armoured Divison, probably burned in my APC.
However, to underestimated an enemy is not the way to fight him/her, so from an ex-professional point of view, I think the Soviets/Russians showed a lot of skills and did control the situation, not entirely, but nothing compare what happened to the USA in Vietnam.