The wars against Islamic State and al-Qaida show that military responses may seem to work in the short term but don’t change much in the long run.
Amnesty International has called on the UK to “come clean” about its role in attacks on the Syrian city of Raqqa last year that killed hundreds of civilians.
Theresa May is preparing to face questions from MPs about her decision to launch air strikes against military targets in Syria alongside the US and France.
Western leaders continue to discuss possible military action in Syria after a chemical attack killed dozens of people in the formerly rebel-held town of Douma last week.
At least 70 people, mostly women and children, have been killed in a suspected chemical attack in Douma, the last rebel-held enclave in Syria’s Eastern Ghouta, rescuers and medics say.