The troll is sending 4000 more troops to Afghanistan, supposedly to train the Afghan army better. I expect that they will participate in the fighting, too.

This added support might push the Taliban back, but that effect will be only temporary.

To defeat the Taliban, better training for the Afghan army is not enough. Better artillery or air support is not enough. What's needed is better morale in the Afghan army, and really caring about victory.

The corrupt Afghan government is not likely ever to inspire such loyalty.