Frequent breakdowns of advanced uranium enrichment devices have inadvertently helped Iran comply with restrictions in the international agreement curbing its nuclear program, according to a new report by a Washington-based think tank.

Iranian compliance also is due to tougher policing by U.S. President Donald Trump's administration of the 2015 pact to prevent Tehran from developing nuclear weapons, the Institute for Science and International Security said in a report due on Friday. A copy of the report was seen by Reuters.

"Iran can be expected to continue to push the deal's limits, commit violations and seek interpretations that are unfounded," the report said. "One should expect many struggles to keep Iran within the nuclear limits for the duration of the deal."