China's Foreign Ministry says nuclear envoys from the United States, North Korea and China have met in Beijing.
Details of Tuesday's meeting have not been released.
Earlier Tuesday, North Korea's nuclear envoy is reported to have said his country is ready to return to six-nation talks on Pyongyang's nuclear program at any time, because it has completed all defensive measures by nuclear testing.
South Korea's Yonhap news agency said Kim Kye-gwan made the announcement after arriving in Beijing.
His counterparts from the United States, China, South Korea and Japan are also in the Chinese capital for consultations on the resumption of disarmament negotiations.
The U.S. envoy, Assistant Secretary of State Christopher Hill, is expected to meet Chinese Vice Foreign Minister Wu Daiwei Tuesday.
Some information for this report provided by AP ,AFP and Reuters.