All discussions about the relations between Afghanistan and Pakistan revolve around the political tension between the two countries and this political tension has existed throughout the seven decades of their shared history.
Besides core parties of the Afghan conflict i.e. the US, Afghan government and Taliban-, the success and endurance of Afghan peace process needs inclusion of regional players as well, though the Afghan government itself is not included in the peace process as of now.
While Afghanistan is no stranger to tragedy, the cutting of U.S. troops by the Trump Administration does not help the situation. It comes at an inopportune time, during a very crucial and tenuous stage in Afghanistan.