Iran’s interim nuclear deal will take effect a week from today after being finalized with six world powers, including the United States. The two sides agreed to a timeline for implementation on Sunday after reaching the agreement in November. Iran will receive partial sanctions relief in return for slowing nuclear operations and capping uranium enrichment at 5 percent. Speaking in Paris, Secretary of State John Kerry said the ensuing talks to reach a final agreement will be a far greater challenge.

Secretary of State John Kerry: “We are very clear-eyed about the even greater challenges that we face in negotiating a comprehensive agreement. We understand it’s going to be a tough negotiation, and we are very clear about what will be required in order to be able to guarantee to the international community that this is a peaceful program. The negotiations will be very difficult, but they are the best chance that we have to be able to resolve this critical national security issue peacefully and durably.”

As part of the agreement, Iran will receive sanctions relief worth up to $7 billion. An initial installment of $550 million in frozen oil revenue will be released next month.