9/11: Twenty years on, Europe seeks a role in Afghanistan after US pullout

The world is currently looking back 20 years, to the devastating attacks of September 11, 2001. As the victims are commemorated, we're also asking what has come out of the two decades of Western engagement in Afghanistan, which began in the immediate aftermath of those attacks. The recent US pullout there has seen the Taliban retake control at a speed no Western government seemingly expected.