This is from English Russia.
Twenty eight years ago Russian army has entered Afghanistan. They stayed there for 9 years and more than 15,000 Russian soldiers were lost dead, much more were wounded or had psychological problems in their civil life later. The troops that were fighting against Russian army at that times were actively supported by Pakistan and Western World as an opposing effort of the Free World against the Evil Empire - USSR.
One of the most notable leaders supporting the rebels against the “Russian oppression” in Afghanistan was a Western supported Osama Bin-Laden. A few years later, when there were nobody to fight against in Afghanistan he found new victims for his fight. Now in the Free Western World that supported him before, with all the tactical skills his people were studied by Western instructors. In Russia there is a proverb, something like “Don’t dig a hole for someone else, as you will fall into it yourself”, some Russian soldiers found that it was true in this occasion, after learning that those guy they fought for years, took over the Afghanistan after they left and started to fight now against his supporters.

All young soldiers look remarkably alike.

Russia was defeated primarily by western trained and armed Taliban. It took them 9 years to give up and go home.
Now the people we trained have combat experience, and a certain expertise in weapons and tactics, and they are our enemies.
Why can’t we just go home and let whoever wants it, run that mess?