On the twenty-fifth anniversary of September 11, former US Ambassador Zalmay Khalilzad reminded Washington that Afghanistan's fate remains bound to American security — not through the idealism of nation-building, but through the cold logic of denial and competition. His argument is ancient in its structure: a vacuum will be filled, and the question is only by whom. In an era of great power rivalry, he suggests, the Afghan question has quietly transformed from a humanitarian mission into a geopolitical chessboard where China, Russia, and extremist networks all seek advantage.