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It is unclear when Mr Kim made the visit and if the site is at the North's sprawling Yongbyon nuclear complex, which produces fissile material for Pyongyang's nuclear weapons.

Washington, however, is preparing to conduct next year at the Nevada Test Site two so-called subcritical experiments involving fissile materials in amounts too small to ignite a nuclear explosion.

President Joe Biden’s failure to revive it, Iran could make the fissile material for one bomb in 12 days or so, according to U.S. estimates, down from a year when the accord was in force.

“I don’t think they are short of fissile materials,” said Mr. Lankov.

However, Iran is also pursuing “research and development activities that would bring it closer to producing the fissile material needed for completing a nuclear device following a decision to do so,” the report said.