Earlier this week, US news editor Andrew Edgecliffe-Johnson sat down with David Miliband, president and chief executive of the International Rescue Committee. In this excerpt, Mr Miliband discusses how Russia's presence in Syria has intensified the crisis, how weak the international political response to the crisis has been, and how the conflict in Syria has dramatised the need for better humanitarian aid. Watch the rest of the interview at ft.com/irc.

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