A foreign affairs journalist says Iran will have to respond to the assassination of a Hamas' leader. \xa0
Iran's vowing to avenge the killing of Ismail Haniyeh after his reported death in an air strike in Tehran.\xa0
Hamas and Iran are blaming Israel, which has so far made no comment. \xa0
It follows an Israeli strike in Lebanon, that killed a top Hezbollah commander. \xa0
The Spectator foreign affairs columnist Paul Wood told Mike Hosking the Iranian Supreme Leader has made it known through various officials' comments that there will be a response. \xa0
He says from their point of view, they have to restore their credibility in their allies' eyes, as this is a humiliation for them.\xa0
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