This was stated at a briefing by the official representative of the UN Secretary General Stéphane Dujarric.
“We cannot verify these claims.
Our position remains unchanged," TASS quoted him as saying.
He stressed that the UN calls on Tehran to comply with all agreements with the IAEA.
Earlier, IAEA experts found that Iran was able to enrich uranium up to 84%.
The head of the US Central Intelligence Agency, William Burns, said that the US does not believe that the Iranian leadership has decided to resume the nuclear weapons program.