How will Iran respond to Israel's assassination of Hamas leader Ismail Haniyeh in Tehran?

Hamidreza Azizi is a visiting fellow at the German Institute for International and Security Affairs. He tells Al-Monitor that Iran's proxies in Yemen, Iraq and Syria will likely carry out a coordinated campaign to avenge Haniyeh's death and that the chances of a ceasefire in Gaza have been dealt a crippling blow. The risk of a full-blown regional conflict is rising.