The head of the UN's nuclear watchdog, Rafael Grossi, told AFP Monday that diplomatic efforts to resolve the dispute over Iran's nuclear program were at a "difficult juncture" but dialogue would continue.

The UN Security Council voted on Friday to reimpose UN sanctions that had been frozen, after three European governments activated the "snapback" mechanism in a decade-old nuclear agreement, accusing Iran of non-compliance.

"It's obviously quite a difficult juncture. It's a very difficult situation we are facing right now," the International Atomic Energy Agency chief said, adding that talks between involved parties were planned in New York for Monday.

"What's important is the communications are continuing. We are planning to see each other if possible today, Monday, here in New York, a

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