Analysis: Why Lammy comes to Geneva as 'most important' member of European trio
David Lammy comes to the Iranian talks in Geneva as "arguably the most important member" of a European trio, our international affairs editor Dominic Waghorn says.
He's in the Swiss city today where foreign ministers from the UK, France and Germany, as well as an EU foreign chief, are meeting with their Iranian counterpart, Abbas Araghchi.
Sky News understands the meetings will take place later today, with the European ministers sitting down over lunch.
The main event with the Iranians will then take place later.
But Lammy comes to Geneva fresh from Washington DC, where he's been meeting with two top members of Donald Trump's team.
Lammy to act as US messenger today
Waghorn explains Lammy met with his American counterpart Marco Rubio and Stephen Witkoff, who is Trump's chief negotiator.
Waghorn says: "We're told the meeting between Lammy and Rubio and Witkoff in Washington was good.
"Sources tell me that the Americans expressed a preference for a diplomatic solution, but stressed that any military solution still remains firmly on the table.
"And I'm told that David Lammy is coming here to Geneva with a message from the Americans for the Iranians, and obviously how the Iranians respond to that message will be absolutely crucial in a sense of us."
Watch his full analysis here: