The European Union on Sunday called for de-escalation and a return to negotiations after the United States joined Israel’s war with Iran by striking Iranian nuclear sites.

Israel launched an unprecedented bombing campaign on Iran on June 13. Tehran has responded by firing missiles at Israel and had vowed to retaliate if Washington joined in.

EU chief Ursula von der Leyen said Iran “must never acquire the bomb” and the bloc’s top diplomat Kaja Kallas described the possibility as “a threat to international security.”

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But both stressed that Brussels remained committed to diplomacy at a flashpoint moment for the Middle East.