New Delhi, July 28 -- TEHRAN - A Ukrainian long-range strike killed one Iranian sailor and wounded several others when it hit a commercial vessel in the Caspian Sea on Saturday, opening a front that has never previously existed in this conflict and drawing a sharp warning from Tehran that the attack "cannot go unanswered."

Iran's Foreign Ministry described the strike as "a blatant violation of the UN Charter" and summoned Ukraine's charge d'affaires in Tehran for a formal protest. Foreign Minister Abbas Araghchi went further, alleging on social media that the attack had been carried out "at Israel's behest to drag Europe into its war," a characterization that inserted the Israeli-Palestinian conflict into a separate confrontation and sig...