VIENNA, Austria – Iran has done next to nothing to respond to international demands to halt its uranium enrichment program and provide information about its nuclear activities, according to a confidential report by the International Atomic Energy Agency.

The U.N. watchdog said in a new report that Iran plans to start setting up thousands of uranium enriching centrifuges this year even as it negotiates with Russia on scrapping such domestic activity.

The IAEA also suggested that unless Iran drastically increases its cooperation, the agency would not be able to establish whether past clandestine activities were focused on making nuclear arms.

The report, by the agency’s director general, Mohamed ElBaradei, to be given to a meeting Monday of the agency’s 35-nation board of governors, stopped short of saying that Iran’s aims might not be peaceful, which would have been an extremely serious finding. Instead, it said Iran’s failure to provide requested information meant that the agency could not say that there are no undeclared nuclear materials or activities.

The report says the agency cannot rule out that Tehran may be breaching the Nuclear Nonproliferation Treaty.

However, in Iran’s favor, ElBaradei’s report also found no evidence that nuclear material had been diverted toward building a weapon.

Earlier in the day, Russian officials played down reports of a deal in principle on the Russian proposal to move Iran’s nuclear enrichment program to Russia, reminding Tehran it first must freeze its domestic uranium enrichment. The United States and the European Union have backed the Russian offer.

But the report made available Monday showed Iran pressing ahead with enrichment at home by going from testing a lone centrifuge – a machine that spins uranium gas into enriched uranium – to introducing the gas into 10 centrifuges and beginning enrichment between Feb. 11 and Feb 15.

Furthermore, said the report, Iran began final maintenance of an additional 20 centrifuges a week ago, reflecting determination to further expand enrichment.