[beavus]

One fundamental tenet of guerilla warfare is that when you have an opposing force which operates from sanctuary, you will eventually lose.

That depends upon the objectives that define a victory. Occupation need not be one of them. Destroy their ability to wage international war (i.e. terrorism), isolate them, and destroy the states that supply them.

[SauronOfMordor]

and destroy the states that supply them.

Among the states that support and supply the Taliban are Saudi Arabia and China. Each is going to be delicate to deal with