A U.S. delegation crossed the heavily-guarded border from South Korea into North Korea Tuesday, for talks on Pyongyang's overdue declaration of its nuclear activities.

The team, led by Sung Kim - the top U.S. State Department expert on the Koreas - will stay in North Korea for three days to discuss the North's nuclear declaration and how to verify it.

Six-country talks on ending the North's nuclear activities have been stalled for months, after Pyongyang missed a December 31 deadline to give a declaration of its nuclear programs in return for diplomatic concessions and energy aid.

The six-party agreement was hammered out among the two Koreas, the United States, Japan, Russia and China.

 

Some information for this report was provided by AFP, AP and Reuters.