Iran has been dealt a heavy blow to its regional reputation and sovereignty by the attack which killed Hamas political leader Ismail Haniyeh and his bodyguard early on Wednesday morning. Details surrounding the nature of the aerial strike on a Tehran apartment have yet to be disclosed, but it has been widely attributed to Israel. The Haniyeh killing is both a structural and psychological blow for Iran. The scale and audacity of the attack on Iran’s capital city – likely conducted by Israel’s notorious spy agency Mossad \- will have left Iran with little choice but to respond. It will have to r…