The following is the Feb. 7, 2019 Congressional Research Service Report, Iran’s Nuclear Program: Tehran’s Compliance with International Obligations.
From the report
Several U.N. Security Council resolutions adopted between 2006 and 2010 required Iran to cooperate fully with the International Atomic Energy Agency’s (IAEA’s) investigation of its nuclear activities, suspend its uranium enrichment program, suspend its construction of a heavy-water reactor and related projects, and ratify the...
https://news.usni.org/2019/02/12/report-congress-irans-nuclear-program