I've played only a few turns so far, but it looks very well done. I really like the sweeping and mountainous terrain and thinking about how to defend it. There are attacks all over, and the Soviet high command

is confused. The concept of trying to keep the roads open, supplies moving and protecting the cities is excellent. It looks like a realistic strategic situation.
I appreciate the Antonov transports; they're great for flying the supply trucks over the guerrilla ambushes

- so you're going to need a house rule there. But I don't know what to do with the trucks - apparently they are supposed to destroy themselves attacking some Warehouse (barbarian) unit. But I can't seem to find one. You might want to write a short play tester's Readme, just to give us an idea of what to look out for.
This seems to be well developed as a non-Lua scenario, but it seems to me it could be significantly enhanced with the help of Lua. Supply and attrition, and developing the interrelationship between the Soviets and the Afghan Communists would be a couple of primary candidates, imo.
I will forge ahead and give another update later.