The dissident National Council of Resistance of Iran (NCRI) exposed Iran's uranium enrichment plant at Natanz and a heavy water facility at Arak in 2002. But analysts say it has a mixed track record and a clear political agenda. Iran says allegations of nuclear bomb research are baseless and forged by its enemies.
Iran and six world powers are trying to meet a self-imposed June 30 deadline to reach a comprehensive deal, but issues remain including the monitoring and verification measures to ensure Iran could not pursue a clandestine nuclear weapons programme.
Citing information from sources inside Iran, including within Iran's Revolutionary Guards Corps, the Paris-based NCRI said the seven person North Korean Defence Ministry team were in Iran for the last week of April. It was the third time in 2015 that North Koreans had been to Iran and a nine person delegation was due to return in June, it said.  
"The delegates included nuclear experts, nuclear warhead experts and experts in various elements of ballistic missiles including guidance systems," NCRI said.

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