Here's a very good explanation of why... https://m.youtube.com/watch?v=Ab9zK8yT4_Y https://m.youtube.com/watch?v=Ab9zK8yT4_Y Basically Afghanistan is very mou

Here's a very good explanation of why... https://m.youtube.com/watch?v=Ab9zK8yT4_Y https://m.youtube.com/watch?v=Ab9zK8yT4_Y Basically Afghanistan is very mountainous and Taliban can just cross the border easily into Pakistan