Almost five months after a US-Israeli air strike killed long-serving Iranian Supreme Leader Ayatollah Ali Khamenei on the first day of open conflict, his son and successor Mojtaba Khamenei has issued his first public address, pledging unwavering revenge for his father’s death and the deaths of other Iranians killed in the ongoing war. The hardline declaration comes as a fragile two-month ceasefire between Washington and Tehran has collapsed, pushing the Middle East back to the brink of full-scale regional conflict.