As Donald Trump decertifies Iranian compliance with the Iran nuclear deal on Friday, I spoke with Radio Free Europe about the effect — not as dramatic as US withdrawal from the accord, or even sweeping American sanctions, but a sign of the ongoing discord caused by Trump’s anger over the Obama-era agreement.

See Podcast: The US and Iran’s Revolutionary Guards

Certainly the US could bring a great deal of pressure against Iran, whatever the other powers do, if it increases sanctions, but that does not mean that the deal is scrapped.

We enter a new phase: will the other five powers not only uphold the deal with Iran but increase their contacts? Do they defy the US and encourage trade and investment?