Kerry says deal will be based on proof, not promises

Kerry says the Natanz facility “will undergo dramatic changes” and others will be converted entirely.

“The vast majority of the centrifuges and its infrastructure” will be demolished there, Kerry says, and uranium enrichment will be capped at 3.67%.

“A final agreement will not rely on promises, it will rely on proof,” Kerry says.

He emphasizes sanctions relief will be “in phases.” The US secretary says that if Iran violates deal, sanctions can “snap back” into place.

“Simply demanding that Iran capitulate is a nice soundbite, but it is not a policy,” Kerry says.

“The test is whether it will leave the world safer,” he says of the deal.

The negotiating partners in the P5+1 and all experts agree “that this is the best outcome achievable.”

“We have no illusions that we have ways to travel” before reaching a final deal, he says.

Kerry says the US consulted with allies, “including Israel,” and says it will defend their security.