The Northern Alliance was an organization of local warlords whose main concerns were to re-establish Afghanistan's former position as one of the leading nations in exporting illegal drugs to the world, and put themselves in command, and reap the rewards. Thanks to the help of the CIA and the US military, that has been accomplished. Let's all celebrate that glorious accomplishment on behalf of free marketeers and freedom-loving people everywhere.

"they cannot win the military struggle irrespective of how long they fight"

Who are we talking about here? The Taliban? The present Afghan government? Or the USA in Afghanistan and Iraq? Could be any one of them, I'd say...

Past experience suggests that no foreign occupying force ever can succeed in the long run when it comes to Afghanistan. Eventually they all leave. When they do, the local warlords set up a new administration, and it's always nasty, brutal and undemocratic. Whether it gets called a "friend" or an "enemy" by the USA or any other great power depends entirely on the international monetary and strategic factors of the time, and has nothing to do with whether it's a good government for Afghans in any sense whatsoever.