The US has sufficient power to negotiate with just about any state or non-state actor. Negotiating with non-state actors can be challenging, since the usual terms of leverage (trade & security deals, sovereignty, etc.) aren’t present, and leadership can be fluid and unpredictable. Seeing as the US helped the Taliban build power by arming them in the 1980’s to resist the Soviet military invasion, the US ought to be able to achieve some influence now as well. Here are 79 books and government docs on the US and the Taliban: bit.ly/BC-taliban-us. Materials on the subject are bound to be partisan, so caution is advised.