Bashar al-Assad has been warned to implement a UN-backed peace plan to end more than a year of violence in Syria, amid growing scepticism at the lack of international resolve to tackle the bloodiest crisis of the Arab spring.
Hillary Clinton, the US secretary of state, issued the threat at a conference of the Friends of the Syrian people in Istanbul on Sunday, but there was little evidence of coherent international action if he does not comply.
Syria announced last week that it had accepted a six-point plan being promoted by the former UN secretary general Kofi Annan, though Assad then demanded that the "armed terrorist groups" he says are supported by an Arab-western "conspiracy" disarm first. According to the UN, 9,000 people have been killed in Syria over the last year.