Quote History Quoted:
When I said follow through after the Russians withdrew, I didn't mean in the form of US military.
USAID, Peace Corps, Financial aid and such were what I meant, including helping set up a government and bringing all the various faction leaders together for talks.
There was a power vacuum that the various warlords were fighting each other for control over.
Afghans got sick of it and the Taliban were invited in to keep the peace, which they did and went full fucktard on power tripping.
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After the Russians withdrew in 1989, the DRA was running the show, and I highly doubt that they would have allowed USAID within a country mile of the border.
The Russians were supporting the Afghans with war material, food and fuel, and the DRA was holding (despite the perception at the time that the Communist Afghan government would collapse in weeks if not days of the withdrawal of Soviet land forces.) The DRA benefited hugely from the Conventional Forces in Europe treaty, as the then Soviets brought literal trainloads of munitions into Afghanistan as aid to the government.
As Soviet aid ended with the end of the Soviet Union (though Russia was supporting the DRA for awhile, probably out of inertia) the Communist DRA was set upon by all of the various rebel factions. The Paks, among others, saw their opening and took it. While their traditional proxies lacked the combat power, a fresh force entered the scene, armed and advised (and reported supported directly with air/arty and intel) by Pakistan. This force from the Pakistani madrassas, the Taliban were cohesive, and unlike the other players, had the logistics to make the mare go.