The world is on edge as Iran retaliates in response to the killing of Maj. Gen. Qassim Suleimani.  

Patrick Buchan is director of the U.S. Alliances Project at the Center for Strategic and International Studies in Washington DC. Patrick explains to Jane Marwick what could come next...

<p>The world is on edge as Iran retaliates&nbsp;in response to the killing of Maj. Gen. Qassim Suleimani.&nbsp;&nbsp;</p>
<p>Patrick Buchan is director of the U.S. Alliances Project at the Center for Strategic and International Studies in Washington DC. Patrick explains to Jane Marwick what could come next...</p>

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