Kallas said that Iran must not be allowed to develop a nuclear weapon, describing the possibility as "a threat to international security" -- but stressed that Brussels remained committed to diplomacy, at a flashpoint moment for the Middle East.

"I urge all sides to step back, return to the negotiating table and prevent further escalation," Kallas wrote on X, adding that EU foreign ministers will discuss the situation on Monday.

Top diplomats from the bloc's 27 nations were already due to gather in Brussels for talks on a range of issues, from Russia's war in Ukraine to Gaza, but Iran is now expected to dominate the agenda.

Kallas's appeal came after she joined top diplomats from France, Germany and Britain for talks with Iranian Foreign Minister Abbas Araghchi in Geneva on Friday.

The European powers had urged Tehran to revive diplomatic efforts with the United States to find a solution in the standoff over its nuclear programme.

But Iran had retorted that it could only consider diplomacy once Israel halted its bombardment of the Islamic republic.

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.

ub/ec/bc

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