I had no idea of the background to this before reading this article. Why am I not surprised that it all stems from centuries of European colonialism and some idiots establishing illogical borders – the Durand Line.
Take the time to read this @ Why Pakistan Supports the Taliban | Military.com and it might clear up some of the fuzziness.
Take the time to read this @ Why Pakistan Supports the Taliban | Military.com and it might clear up some of the fuzziness.