VIENNA (AP) — Iran continues to comply with the nuclear deal reached in 2015 with major powers even after the withdrawal of the United States, the United Nations' atomic watchdog said Thursday in a confidential report.

In the quarterly report distributed to member states and seen by The Associated Press, the International Atomic Energy Agency said Iran has stayed with key limitations set in the so-called Joint Comprehensive Plan of Action, or JCPOA.

The conclusion comes as the other signatories to the landmark 2015 deal — Germany, Britain, France, Russia and China — continue to try and salvage it after President Donald Trump decided to pull the U.S. out unilaterally in May.

The deal exchanges economic incentives for nuclear guarantees. Since the American withdrawal and re-imposition of sanctions, Iran's economy has already started to struggle and its currency has plummeted in value.