Syria’s population — at the heart of so many proxy battles for influence — last night found itself drawn into a different kind of conflict — this time over the future of British politics. After the British Parliament’s vote against action in Syria, the former Liberal Democrat leader, Lord Ashdown, tweeted that Britain is a “hugely diminished country” this morning: “In 50 years trying to serve my country I have never felt so depressed/ashamed.” But is he right to see this vote as a retreat into isolationism? I think it is rather a step into a more modern diplomacy, one where politics do not end at the water’s edge.