Intervention

Britain's Prime Minister Cameron leaves 10 Downing Street in London...Britain's Prime Minister David Cameron leaves Number 10 Downing Street to attend parliament in London August 29, 2013. Britain's parliament has been recalled to vote on how to respond to Syria's suspected use of chemical weapons. REUTERS/Suzanne Plunkett (BRITAIN - Tags: POLITICS CONFLICT)

Suzanne Plunkett/Reuters

David Cameron, UK prime minister, leaves Number 10 Downing Street to attend parliament in London on Thursday. Britain’s parliament has been recalled to vote on how to respond to Syria’s suspected use of chemical weapons