Hey no problem. If you prefer to identify yourself via ignorance, based on....sorry, I'm chuckling a little too hard to type well, here...based on MSNBC's reports from "deeeeeep inside" the clandestine services, it's no skin of my nose.
If, on the other hand...
Back in early 79, after Afghan army captain Ismail Khan had called for jihad in Afghanistan, against the "communist usurpers", an internecine power struggle arose between different factions of Soviet military and intelligence and their respective Afghan pawns.
To save a long boring stretch of background, individuals under an umbrella we'll label "KGB" outlined a strategy for consolidating power to their front man in Afghanistan, Nut Mohammad Turaki. Part of this strategy was to falsely engage the Americans in order to secure a wider power base in political Afghanistan as the hardline Islamist movement, inspired by the Iranian Revolution, gained ground.
Another rival communist in Afghanistan vying for power, Hafizullah Amin, became just a bit too convinced of his destiny for greatness, and a little too greedy, and asked his handlers at "KGB" to grant him check writing authority for their considerable accounts earmarked to support communist rule in Afghanistan.
That set off alarms up and down the chain, and so the "KGB" faction more loyal to Turaki planted the seed that Amin was a CIA plant to discredit him.
Coincidentally, Amin then proceeded to meet with certain organizations known to have CIA contacts, and the original authors of the CIA rumor began to wonder if their own story wasn't true.
The KGB then sent a cable to Brezhnev in November 1979 noting that Amin "has had contacts with the American charge d'affairs several times" but had not filed contact reports with his Soviet handlers.
Official Moscow, notably Brezhnev and rising potential rival Andropov, having no other information to contradict the KGB assertions that Khan was a CIA "double", decided to assassinate Amin and invade Afghanistan to re-establish Soviet control.
The first Politburo decision to invade was taken on November 26th, 1979. On December 7th, Babrak Karmal, the KGB's "heir designate" landed at Bagram AB in a Tu-134. Over the next couple of days, KGB attempted a failed poisoning of Amin, and a failed sniper attack, and abandoned the assassination effort, instead to wage a massive frontal assault and deal with Amin after the military takeover.
Certain non-State personnel stationed at the US Embassy were aware of large parts of this picture at the time, but not aware of the original KGB sowing of disinformation designed to restrain Amin, and were also not aware of later KGB assertions that Amin really was working with CIA, and were therefore, essentially totally surprised when the Soviets actually invaded Afghanistan in December. Their impression was that Amin was a bad egg, involved in the assassination of a US diplomat, hostile to US interests and growing more antagonistic by the day.
Well after the fact, when cables sent from local KGB handlers to Moscow became available to western intelligence, it was with wonder that CIA field analysts finally understood their mistake and the phenomena that led to both it, and the unanticipated Soviet invasion.
Blowback.
Now you know.
;-)