The assassination of Hamas leader Ismail Haniyeh in Tehran has provoked strong condemnation from Iran, with Supreme Leader Ayatollah Ali Khamenei vowing severe retribution against Israel for the attack, which he described as a violation of Iran's sovereignty. Khamenei stated, 'The criminal Zionist regime has murdered our guest in our house,' emphasizing that the blood of Haniyeh would lead to Israel's downfall. Iranian President Masoud Pezeshkian echoed these sentiments, asserting that the incident would strengthen ties between Iran and Palestine and promising that the attackers would regret their actions. Turkey also condemned the assassination, accusing Israel of escalating the conflict, while Russia labeled it an 'unacceptable political murder.' Hamas has officially declared Haniyeh's killing a grave escalation by Israel, claiming it intends to break the will of the Palestinian resistance. Investigations into the circumstances surrounding the assassination are ongoing.