Good evening. I'm John Yang.

Iran is bracing for global sanctions over its nuclear program to go back in place.

The measures threaten to cripple Iran's economy.

Their currency is at a record low, and ordinary Iranians are struggling to get the food they need to survive.

The UN Security Council rejected a last-ditch effort to delay the sanctions after negotiations with European nations failed to reach a deal.

Barring some sort of last-minute diplomatic breakthrough, the renewed sanctions will freeze Iranian assets abroad,

penalize any development of Iran's ballistic missile program, and ban the sale or transfer of conventional weapons.

Frontline correspondent Sebastian Walker conducted an exclusive interview earlier this week with

Ali Larajani, head of the Iran's Supreme National Security Council.

Seb, he previewed for you Iran's reaction to these sanctions going back in place.

Let's listen to what he had to say.

First, the matter of Estabag would be held to help us to back to speak.

It's conditional.

When they're in our case in our ma'amble to us and to force to make up and

make sure we're doing it. we're the reason we have to be

with Ajan's

a relationship

to be able to be

Tell us more, who is Ali Larajani

and why is this so significant?

So he is the Secretary of Iran's

Supreme National Security Council.

...