Iran’s foreign minister made a brief and unannounced visit to the G7 summit in France on Sunday.
Mohammad Javad Zarif attended side-line talks in the seaside town of Biarritz where world leaders, including US President Donald Trump, have gathered.
Mr Zarif said on Twitter that he held “constructive” talks with his French counterpart and the French president.
“Road ahead is difficult. But worth trying,” he posted on Sunday evening, adding he gave a joint briefing to German and British officials.
Mr Zarif also met President Emmanuel Macron in Paris on Friday on the eve of the summit.