The basic facts of the conflict in Syria make grim reading. Two years of violence and civil war; over 90,000 dead, with 5,000 people now being killed each month; suggestions that chemical weapons have been used; 4 million people internally displaced, and 1.5m refugees in neighbouring states, about half of whom are children.
There was a time when the ambition to make progress in disarmament was considered a sign of naivete in international affairs. Thankfully this is no longer true.
If Cameron’s time as Leader of the Opposition had a uniting theme, it was the ambition to detoxify the Tory brand. It was more than a central theme in fact: it was the driving mission.