The European Union's warning regarding the re-escalation of tensions between the US and Iran Kaya Callas, the head of the European Union's foreign policy, warned of the serious risk of a re-escalation of the tensions between the US and Iran and said that another conflict is not in the interest of either side. Callas said at a press conference after the meeting of the group of five European defense ministers in Paris: "There is a serious risk of a re-escalation of tensions between the US and Iran, and any new tension will only have losers."