What are Hezbollah's choices after Israel killed its leader, and which way will Iran point?

The risk of a region-wide war is growing as Israel carries out ground and air operations against Hezbollah targets in southern Lebanon and beyond. Hezbollah and Iran have been irreversibly weakened in this latest cycle of violence, argues scholar Lina Khatib of Chatham House. 

Editor's note: This interview was conducted just prior to Iran's missile attack on Israel on Tuesday.