Iranian Foreign Minister Abbas Araqchi says a Ukrainian attack on an Iranian commercial vessel “cannot go unanswered.” Araqchi makes the remarks in comments posted on social media after calls with EU foreign policy chief Kaja Kallas and Russian Foreign Minister Sergei Lavrov. According to the accounts, the incident occurs in the Caspian Sea and involves an explosion on the Iranian vessel. Iran states that the blast kills one sailor and injures another. Lavrov responds by offering condolences over the death of the sailor, according to a statement published on the Russian Foreign Ministry’s website. The two outlets describing the incident also report that Araqchi frames the matter as requiring a response, while not detailing what action Iran intends to take. The reports present the Iranian and Russian responses and Iran’s message to EU and Russian counterparts, without providing additional operational or legal findings on the cause of the attack or responsibility beyond the attribution described by Iran.