Iran's Foreign Minister Abbas Araqchi said the two countries had reached an understanding on the main "guiding principles", but work still needs to be done.

French Foreign Minister Jean-Noël Barrot said the vessel was departing Marseille after a payment of "several million euros".

Local police say the missing woman's relatives are victims - and "to suggest otherwise is not only wrong, it is cruel".

Expectations for a breakthrough are low as negotiators meet at a US-brokered talks to try end the war.