Afghanistan: Echoes of the fall of Saigon

Why is the Taliban's Kabul victory being compared to the fall of Saigon?
https://www.bbc.com/news/world-asia-58234884

Scenes in Kabul are 'way worse than Saigon'
https://edition.cnn.com/2021/08/16/politics/white-house-afghanistan-biden-crises/index.html

Chaos and confusion: The frenzied final hours of the US backed Afghan government
https://www.bbc.com/news/world-asia-58477131

Biden defends 'messy' US pull-out from Afghanistan
https://www.bbc.com/news/world-us-canada-58238497

Staying in Afghanistan without the US was never really an option for the British.
https://www.bbc.com/news/uk-58302734