That depends. It does not invoke Chapter VII of the UN charter which can be used to authorise military action in order to restore peace and security. But Mr Cameron has always said he already has authority to act in self-defence and in the words of Matthew Rycroft, Britain's permanent representative to the UN, the resolution is a “powerful part of the case that the Prime Minister is setting out in terms of the British role in Syria and elsewhere”. But others interpret it differently.