North Korean leadership never tires of showing a complete lack of class; even as U.S. Assistant Secretary of State for East Asian and Pacific Affairs Christopher Hill in is North Korea, the IAEA visit has been put on hold because North Korea claims it has not received its $25 million:

The chief U.S. nuclear negotiator began a surprise two-day visit to North Korea on Thursday. . . In the first visit to Pyongyang by a senior U.S. official in nearly five years, the envoy, Christopher Hill, was scheduled to meet with senior North Korea officials, including his counterpart, Kim Kye Gwan, for one-on-one talks. Hill was scheduled to spend the night in the North Korean capital before leaving on Friday.

However:

North Korea said on Thursday a planned visit by U.N. nuclear monitors was on hold because it had not received unfrozen bank funds, shaking hopes Pyongyong would start disabling its atom bomb programme soon.

But Russia said later the $25 million, released as part of North Korea’s nuclear disarmament deal with five powers, was on its way to a North Korean account in a bank in Russia.

“All the North Korean funds are being transferred to a bank on Russian territory right now, as I speak to you,” Russian deputy Foreign Minister Sergei Kiselyak told a news briefing.

Russian news reports the funds will be in the account by Friday.