and run out of russia our moscow correspondent sarah rainsford files herfinal report from the country after being labelled a threat to national security. good evening. i m christian fraser in london. tonight, a hugely symbolic moment. the commander in chief, joe biden, addressing the nation to formally put an the end to the united states longest war. last night, it was the pentagon that confirmed the details of the final withdrawal. the president preferring to put some space between the operational details and the much bigger, more poignant questions america is asking of itself and of their president. what was it for if the taliban are now back in power?