Peter Maurer to discuss reuniting families separated by war.
Response seen as sign of country's interest in keeping up diplomacy.
Exercises begin amid tentative signs of easing tension with N. Korea.
Workers are seen inspecting and testing finished products but no manufacturing process is shown.
Washington and Pyongyang appear unable or unwilling to negotiate.
Both countries appear unable to negotiate over the detainee.
Kaesong complex is last remaining symbol of inter-Korean cooperation.
Satellite photos show country doubling size of uranium facility.
Festivities marked 60th anniversary of the truce that ended Korean War.
Work stoppage may reflect decision to slow or stop building larger rockets.
