VIENNA (AP) — The U.N. atomic watchdog reported Friday that Iran remains in violation of limitations set by the 2015 nuclear deal with major powers and that its stockpile of low-enriched uranium is increasing.

In a confidential quarterly report distributed to member states and seen by The Associated Press, the International Atomic Energy Agency said Iran’s stockpile of low-enriched uranium still exceeds the amount allowed by the so-called Joint Comprehensive Plan of Action, or JCPOA.

It also said Iran continues to enrich uranium up to 4.5%, above the 3.67% allowed.

The violations were announced by Iran, and confirmed by the IAEA last month, and are meant to put pressure on the signatories to the JCPOA to provide more economic incentives.

Enriched uranium at the 3.67% level is enough for peaceful pursuits but is far below weapons-grade levels of 90%. At the 4.5% level, it is enough to help power Iran’s Bushehr reactor, the country’s only nuclear power plant.

The nuclear deal is meant to keep Tehran from building atomic weapons in exchange for economic relief.

It has been complicated by the unilateral withdrawal of the United States from the deal last year and Washington’s increased sanctions, which have been taking a toll on the Iranian economy.