This has the makings of a big international political argument:

TOKYO (Reuters) – North Korea will not return to six-way talks on its nuclear programme unless the United States ends its financial crackdown on Pyongyang’s assets, Kyodo news agency quoted a senior North Korean official as saying.

“Under such pressure, we cannot return to the six-way talks. Our position has not changed,” Kyodo quoted Ri Gun, North Korea’s deputy chief envoy to the talks, as saying in New York on Tuesday following talks with U.S. officials.