Iranian Foreign Minister Mohammad Javad Zarif and U.S .Secretary of State John Kerry are focusing on a landmark nuclear deal with Tehran as the U.N. nuclear agency prepares to release a report on whether Iran has met commitments under the accord.

Zarif and Kerry are to meet Saturday in Vienna, headquarters of the U.N's International Atomic Energy agency. Ahead of that, Zarif said the deal would hold, telling Iranian media that all parties would "not allow the outcome of these talks to be wasted."

IAEA certification that Iran is honoring its obligations would trigger sanctions relief for Iran worth an estimated $100 billion.

Under the July 14 deal, Iran agreed to crimp programs it could use to make nuclear weapons in return for an end to international nuclear-related sanctions