Traces of highly enriched uranium have been found on some North Korean documents provided to the United States during the ongoing effort to shutter the Stalinist state’s nuclear operations, the Washington Post reported Saturday (see GSN, June 20).

Pyongyang has denied U.S. allegations that it has operated a uranium enrichment program alongside its known plutonium effort, which is believed to have produced enough material for several weapons.

North Korea in May gave U.S. officials more than 18,000 pages of documents on plutonium operations at the Yongbyon nuclear complex. The handover came ahead of the anticipated release this week of a declaration of North Korean nuclear holdings and activities, a crucial component of a 2007 denuclearization agreement ...