Iran has promised retaliation for the assassination of Qassem Suleimani. Donald Trump said this will lead to a disproportionate response from the US. One side can deliver on its threats, the other can't, unless it goes nuclear.

Iran means business

"Our reaction," Iranian general Hossein Dehghan said at the weekend, "will be wise, well considered and, in time, with decisive deterrent effect."

Dehghan also noted that Iran was not seeking a wider confrontation with the US.

"It was America that has started the war. Therefore, they should accept appropriate reactions to their actions. The only thing that can end this period of war is for the Americans to receive a blow that is equal to the blow they have inflicted."

Dehghan is no run-of-the-mill former Iranian general officer, but was one of the major decision makers within the Islamic Revolutionary Guard Corps (IRGC) during the Iran-Iraq War, and later went on to command the IRGC Air Force, before eventually being appointed Iran's minister of defense. After stepping down from that position, Dehghan became a special advisor to the Supreme Leader of the Islamic Republic Ali Khamenei.