British involvement in Afghanistan was not a “hopeless endeavour” despite the Taliban takeover, Tony Blair has said. The former prime minister said the sacrifice made by UK troops — including those who died — “was not in vain”. Mr Blair said achievements in the country over the past 20 years — including a generation growing up without Taliban rule — was a “good cause” that “matters today”. He has criticised the US decision to withdraw its military from the country. Speaking to broadcasters, the former Labour leader shared concerns, not only for the Afghan people who he said stood to lose out, but also for the security of Western countries.