Iran's top diplomat has made a brief surprise visit to Biarritz, where leaders of the world's seven most industrialised countries are currently gathered for the G7 summit.
Foreign Minister Mohammad Javad Zarif flew in for talks on the sidelines with French President Emmanuel Macron.
The discussions were organised at very short notice.
France has been trying to revive the 2015 nuclear deal, which the US pulled out of last year.
The Trump administration has imposed harsh sanctions on Iran to pressure it into acceding to its demands.
Al Jazeera's James Bays reports from Biarritz.