Here is more from the Wall Street Journal:
In late May, dozens of U.S. intelligence officials, military officers and security analysts gathered in Omaha, Neb., to assess the escalating nuclear threat from North Korea as the regime develops new tactical nuclear weapons.
The previously unreported event was the first at the headquarters of U.S. Strategic Command, the arm of the Pentagon charged with deterring America’s rivals, to focus solely on North Korean dictator Kim Jong Un’s nuclear program, according to a spokesman for the organization.
The North Korea meeting on May 23-24 was coordinated by the Office of the Director of National Intelligence, which advises the president on national security, and the Defense Intelligence Agency, which provides information on foreign militaries to the U.S. military.
Those that attended include Markus Garlauskas, a former national intelligence officer for North Korea at the ODNI, who is a Nonresident Senior Fellow at the Atlantic Council.
Another attendee was Ankit Panda, a Senior Fellow at the Carnegie Endowment for International Peace.