Iran's supreme leader Ayatollah Ali Khameni has warned any attack on his country would spark a regional war.

It comes as the United States and Iran have indicated a deal on Tehran's nuclear and missile programs could be in reach following a build-up of American warships in the region.

So what's more likely a deal, or a war?

• Guest: Jonathan Panikoff, Director of the Scowcroft Middle East Security Initiative at the Atlantic Council
• Producer: Pip Cook