Not to be a pedant but the US (and UK) armed and trained the mujahideen who largely went on to become the Taliban who oppressed their population and allowed al’qaeda to reside, train and plan attacks from within their borders which ultimately lead to the 9/11 attacks which precipitated a lengthy occupation by allied forces in which many more thousands died, and the eventual withdraw of said forces resulting in the Taliban taking back control, oppressing their population and no doubt once again providing a safe haven for terrorists aligned against the west.
I would say that if Ukraine ends up “like afghanistan” it would be a very bad thing indeed for everyone. Russia, the west, Ukraine. Everyone.